#Mugen Path (無間道)

Contents

Exclusive special path for 10-dan Tatsujin. A campaign-ending device on par with the main-campaign Renown Title. Mutually exclusive.

Core References: School System · School Data · 10-dan Renown Title · Index

"That there is no end does not mean there is no end — it means there is no sense of an end." — Mumyo (無明) of Avici

---

#§ Critical Warning — A Campaign-Ending Device Equal to the Renown Title

#Full Application of the Renown Title GM Warning

All principles of the main-campaign Renown Title GM Warning section "Renown Titles and Campaign Endings" apply to the Mugen Path without exception.

• Intentionally designed to nullify core systems
• Recommended to acquire 1–3 sessions before campaign conclusion
• Continued play after 10-dan is not recommended
• Multiple Renown Title/Mugen Path holders in the same party destroys campaign balance

The Mugen Path is not a "special form" of the Renown Title; it is the 4th path added to the 3-path Renown Title system. The choice is exactly one of 4 options: class capstone · background capstone · skill saint · Mugen Path.

#Mutual Exclusion Rule

A PC who has chosen the Mugen Path:

• Cannot hold any of the 3 Renown Title paths simultaneously
• May already hold hell schools (Toukatsu-ryu · Kokujo-ryu · Kyoukan-ryu · Shonetsu-ryu) and still choose the Mugen Path (hell schools are technology up to the 4-pt secret art, while the Mugen Path is a 10-dan special path at a different tier)
• After choosing the Mugen Path — cannot re-select a Renown Title (no path change other than character recreation)

#Recommended Play Length After Acquisition

The reason is the same as for the Renown Title. A Mugen Path holder becomes a being that "does not end" at the individual combat scale. Ordinary combat rules cannot handle such a being.

#Warning Against Stacking Mugen Path + Renown Title in the Same Party

When a Mugen Path PC and a Renown Title PC coexist in the same party, combat is effectively rendered non-combat. Examples:

• Mugen Path + Sword Saint = PC1 never dies + PC2's every attack auto-hits → attacking PC1 is meaningless; attacking PC2 triggers auto-dodge
• Mugen Path + War God = PC1 sustains indefinitely + entire party has unlimited Energy → no cap on sustained rounds
• Mugen Path + Dharma King = PC1 is undying + entire party is immune to incapacitation → a completely undying party

The GM must be aware of this combination in campaign design and keep Mugen Path and Renown Title holders to at most 1 in the party (or 0 — only 1 at the campaign-conclusion moment).

---

#§ Scent (香) — What Is the Mugen Path?

#The Deepest Layer of the 8 Great Hells

Mugen (無間) is the eighth of the 8 great hells — the deepest layer. "Avīci" — the hell of "no interval." The destination for those who have accumulated the heaviest karma. Pain does not cease for even 1 second, time does not flow, and there is no end.

In the Drift of the Spirit Realm interpretation, the essence of Mugen is not "eternal suffering." It is "the Absence of everything." A state without even suffering. No time, no distance, and no sense of there being no end. Complete Absence (see Buddhist 8 Hells GM Guide, Section 5).

#Definition of the Mugen Path

The Mugen Path is — the path of existence-transcendence that someone who has experienced Avici Hell and returned alive has mastered through that experience. If the other hell schools (Toukatsu-ryu · Kokujo-ryu · Kyoukan-ryu · Shonetsu-ryu) are skill-based schools, the Mugen Path is not a skill. It is a change in the PC's mode of existence itself.

What the main-campaign Renown Title provides is "extreme external dominance" — seizing the battlefield alone, auto-hits, Surprise Attack instant-kill, and so on. What the Mugen Path provides is "extreme self-persistence" — not dying, no sense of pain, time-externality.

This is not "becoming stronger." It is "not ending." A PC who has chosen the Mugen Path — is already, from that moment, in a state where they have partly departed from ordinary Humanity.

#3 Axes — Undying · Infinite-Pain Endurance · Time Distortion

The core effects of the Mugen Path are composed of three axes.

Axis 1. Undying (不死). The PC maintains consciousness even when Wounds reach 0. They do not become incapacitated. As long as the conditions for physical death are not met — the character does not exit in any state during ordinary combat.

Axis 2. Infinite-Pain Endurance (無限苦痛感忍). The PC feels physical and spiritual pain, but that pain does not hinder the PC's actions. Wounds · Curse · Fear · bleeding · poison — all status ailments still apply, but action penalties are removed. The PC still takes damage, but damage cannot slow the PC down.

Axis 3. Time Distortion (時間歪曲). The PC can make the time of a round flow slowly for themselves alone. Once per round, 1 additional free action may be declared. This additional action follows the ordinary Energy rules, but — it is inserted between the actions of other PCs and enemies in initiative order.

The combination of these three axes makes the Mugen Path PC conceptually undefeatable.

---

#§ Law (法) — Detailed Rules of the Mugen Path

#Prerequisite for Selection — Residency at Avici Hell Depth 3 or Higher + Return Alive

To select the Mugen Path, the PC must — during the campaign — have resided at Avici Hell depth 3 or higher and returned alive. This is fulfilled through the experience in Drift of the Spirit Realm Chapter 5 (the chapter of endlessness).

A PC who has not satisfied this condition cannot choose the Mugen Path even at 10-dan promotion. Only the 3 main-campaign Renown Title paths are available.

#Strictness of the Prerequisite

"depth 3 residency" is not mere passage. The PC must have experienced the Avici gimmick (sensory erasure) to at least 3 stages. That is, they must have experienced the state of having lost all sense of time, distance, and temperature at least 1 time within a session.

"Return alive" means the state of having returned to the domain and completed at least 1 lull. Simply having exited Avici is not sufficient — a process of rediscovering oneself within the Barrier of the domain is required.

#Choice at 10-dan Promotion

At 10-dan Tatsujin promotion, the PC chooses one of four paths.

Choosing the Mugen Path cannot be undone. Once chosen, that character walks the path of the Mugen Path.

#Effects — Detailed 3 Axes

#Axis 1 — Undying (不死)

[Aptitude] Undying (不死)
Type: Aptitude | Energy: 0 (always)
Effect: Even when Wounds reach 0, the PC does not become incapacitated.
    Consciousness maintained, actions possible. Attack/Defense checks normal.
    However, Wounds may go negative — Wounds -1, -2, -3 ...
    Actions possible even at negative Wounds.
    "Death" occurs only when one of the following conditions is met:
     - Wounds reach -10 or lower (very rare)
     - Direct target of a special sealing/Break technique (GM's call)
     - PC player's explicit declaration (ending it themselves)
    After combat, during lull: Wounds automatically recover to at least 1.
    Negative state cannot persist.
Limit: None (always).

Design note: This effect is different from the main-campaign "incapacitation immunity" (Dharma King). The Dharma King keeps Wounds at 0→1. The Mugen Path allows negative Wounds. The PC effectively does not die — within ordinary combat. Negative Wounds accumulate requiring recovery at each lull, but it is rare for a PC to exit during the middle of a campaign.

#Axis 2 — Infinite-Pain Endurance (無限苦痛感忍)

[Aptitude] Infinite-Pain Endurance (無限苦痛感忍)
Type: Aptitude | Energy: 0 (always)
Effect: The PC still receives all status ailments (Fear · bleeding · poison · Curse · confusion · restraint, etc.).
    However — the **action penalties imposed by these ailments are entirely nullified**.
    Example: "Fear: attack check -2" → Mugen Path PC has no -2. Normal check.
    Example: "Bleeding: 1 Wound per breath" → Mugen Path PC still takes bleeding damage, but acts normally.
    Example: "Restraint: cannot relocate" → Mugen Path PC is still restrained, but actions (attacks · Sorcery) are possible.
    However, damage itself occurs normally. "Facts" such as Wounds reduction, memory loss, and sensory erasure persist.
    The only thing that changes is "penalties to the PC's actions."
    "The pain is there. It simply cannot stop me."
Limit: None (always).

Design note: This effect makes the PC "one who acts to the end." Tactics that neutralize the PC via status ailments become ineffective. This eliminates more than half of the threat elements of boss combat.

#Axis 3 — Time Distortion (時間歪曲)

[Tactic:Kata] Time Distortion (時間歪曲)
Type: [Tactic:Kata] | Energy: 0 (automatic)
Effect: Automatically activates at the start of every round. No Energy consumed.
    Within that round the PC may perform **1 additional free action**.
    This additional action follows the same rules as ordinary actions (same Energy · checks · limits).
    However, in initiative order it is inserted **between the actions of other PCs and enemies**.
    The PC may immediately insert their additional action right after another's action.
    "One round for the PC = effectively two rounds."
    "Time is slow only for me."
Limit: 1 time per round. Combat duration.

Design note: This effect is the destruction of action economy. An ordinary PC has 1 main action per round plus multiple possible breaths. The Mugen Path PC can effectively act on the scale of 2 main actions. This resembles the initiative Rank 1 effect of the main-campaign Phantom Wanderer (ronin Renown Title), but yields a stronger quantitative gain.

#Declaration and Activation Timing

The 3 axes of the Mugen Path are mostly always-on. The exception is Time Distortion — automatically activates at the start of each round. The PC chooses the moment to use the additional action.

Restrictions on when the additional action may be used:

• "Immediately after the action declaration" of another PC or enemy (before the check)
• Or "immediately after the check result is revealed" for another PC or enemy (before damage is applied)

This timing makes interrupts possible. At the moment an enemy's attack hits — the Mugen Path PC can insert their own action at that moment and eliminate the enemy first. However, this does not nullify an already-determined check result — the determined result is applied as-is.

---

#§ Teaching Requirements — The Masterless Path

#The Mugen Path Is Learned from No One

Whereas the other hell schools require a master, the Mugen Path has — no master. Because there is no being in Avici Hell that could serve as a master. In Avici, every being cannot even reach themselves.

The Mugen Path is a path the PC awakens to alone in Avici. the depth 3 experience, the repeated sensory erasure, and the return alive. A PC who has passed through these three stages — without a master, from within their own inner self, masters the principles of the Mugen Path.

#Condition for Return — The Importance of Connection

According to Section 5 of the Buddhist 8 Hells GM Guide, escape from Avici is impossible without an external connection. One cannot emerge alone.

This applies to the Mugen Path as well. The PC returns from Avici through one of: a companion's voice · a memory of incense · an external summons. This "connection" is the paradoxical core of the Mugen Path. One who has obtained the Mugen Path — becomes a being that does not end alone, yet to reach that attainment they had to be connected to someone.

This paradox is the narrative weight of the Mugen Path. One cannot obtain the Mugen Path alone. Yet after obtaining the Mugen Path — one does not end even alone.

#Acquisition Point — 10-dan Promotion

The Mugen Path is acquired at the moment of 10-dan Tatsujin promotion. Late in Campaign Chapter 5, after experiencing Avici Hell depth 3 and returning to the domain → 10-dan promotion.

This point — is the same as the recommended point for the main-campaign Renown Title. 1–3 sessions before campaign conclusion.

#External Connector NPCs

The "external connector" required for the PC's return from Avici is ordinarily one of the following.

The GM selects the connector to suit the PC's narrative. If there is no connector, the PC cannot leave Avici — and therefore cannot obtain the Mugen Path.

---

#§ Heart Shifts on Use (Q9 Decision Applied)

#The Mugen Path's Corresponding Hearts — Way of Emptiness or Truth (眞)

The Mugen Path is not an emotion-based school. Rather — the Absence of emotion is its essence. The mirror of Avici showed the PC "the Absence of anything," and the PC received that attainment with their body.

For this reason, the Mugen Path's heart shifts differ from those of other schools.

Void (虛) is the dark heart of the Way of Emptiness among the 6 official hearts of the main-campaign Three Ways and Six Hearts. In the context of the Mugen Path, the boundary between Truth (眞) and Void (虛) wavers particularly quickly. If Truth is "gazing at truth," Void is interpreted as "the tendency to empty out even truth."

#Heart Shift Situations

#The Meaning of Accumulated Heart Shifts

A PC who has obtained the Mugen Path — can have heart shifts in nearly every round. During the 1–3 sessions of campaign conclusion, heart shifts accumulate rapidly. This accumulation determines the PC's final character.

PC accumulating in Truth/Void direction: A saint who has accepted the truth of "emptiness" through the Mugen Path. Becomes quiet, speaks less. A being who can offer solace to other PCs. At campaign conclusion — enters seclusion or departs on a deeper journey.

PC accumulating in No Heart direction: A being who has reached the state of "feeling nothing" through the Mugen Path. Neither cold nor warm. Simply — existing. At campaign conclusion — disappears, or becomes a being who has strayed from human society.

The GM observes which of these two directions is accumulating and tailors the staging of the campaign conclusion accordingly.

---

#§ NPC Users — Mugen Path Holders Among Spirit Realm Intelligences

#Fixed NPCs

NPCs who hold the Mugen Path are extremely rare.

Mumyo is not a master. The Mugen Path is a path obtained without a master. Mumyo is merely a being who alleviates the PC's loneliness. Even so, the PC — comes to remember Mumyo. This memory becomes the seed for the PC's return from Avici.

#Hostile NPCs — Rare

Beings who "use the Mugen Path in a hostile way" are exceedingly rare. This is because the Mugen Path is not an emotion-based attack but a path of self-persistence. To appear as an enemy — they must be in competition with the PC.

#Rival PCs

When another PC in the party obtains a Renown Title and this PC obtains the Mugen Path — the paths of the two PCs are contrasted. The GM uses this contrast as an axis of the campaign narrative.

---

#§ Example Scenarios

#Scenario 1 — "Silence of Nothingness" (Just Before Chapter 5 Climax, 1–2 Sessions)

Premise: Campaign Chapter 5. The PC party enters Avici Hell depth 3. One PC (already at 9-dan, just before 10-dan promotion) is experiencing sensory erasure at 3 or more stages.

Development:

1. At Avici depth 3, the PC — is suddenly separated. They cannot hear the voices of the other PCs.
2. The GM actually falls silent for 1–3 minutes (see the Silence of Nothingness gimmick of Avici). This silence becomes a real experience for the PC's player.
3. During the silence the PC sees a being — Mumyo. Mumyo does not speak. They simply sit beside the PC.
4. This silence and Mumyo's presence — cause the PC to master the core of Avici. "That there is no end means there is no sense of an end."
5. One member of the party calls the PC's name. This voice — penetrates the silence and reaches the PC. The PC leaves Mumyo behind and returns to the party.
6. After returning to the domain, the PC reaches 10-dan. The Mugen Path is available for selection.

Side event: During this scenario, the GM must reach an agreement with the PC's player in advance. 1–3 minutes of actual silence is a powerful experience for the player. Not all players may want this.

#Scenario 2 — "The Mugen Path in the Final Battle" (Campaign-Conclusion Session)

Premise: A PC who has acquired the Mugen Path participates in the campaign's final battle. The enemy is the final boss-class yoma of Chapter 5 — "The Lord of Absence (無の主)" (scenario-specific yoma).

Development:

1. Final battle begins. Entire party near 10-dan. Lord of Absence: Wounds 20, Defense 25.
2. First round. Entire party attacks. The Mugen Path PC — activates Time Distortion and inserts an additional action between their main action and the enemy's counter.
3. The enemy makes a powerful attack on the Mugen Path PC (Fear + restraint + bleeding +9 Wounds damage). An ordinary PC would be incapacitated and unable to act.
4. Mugen Path PC: Wounds -3 (enters negative). Infinite-Pain Endurance nullifies all penalties. Actions normal.
5. The PC continues combat the next round as well. Time Distortion additional action eliminates the enemy's supporting yoma.
6. After several rounds, the party's combined attacks bring the Lord of Absence to Wounds 0. The final strike is the Mugen Path PC's additional action.
7. Combat ends. The Mugen Path PC recovers during a lull from Wounds -5. Returns to Wounds 1.

Side event: After the battle, the Mugen Path PC — has already partly departed from Humanity. The party witnesses this. This scene becomes the epilogue staging of the campaign. The PC enters seclusion, sets out on a journey, or becomes the guardian of the domain (each is optional).

---

#§ Long-Term Effects and Epilogue

#The PC After Acquiring the Mugen Path

A PC who has obtained the Mugen Path — is no longer an ordinary human. The following characteristics gradually manifest.

These changes make the PC a being that is undying — physically, socially, and narratively.

#Epilogue Options

At campaign conclusion, the Mugen Path PC's epilogue is chosen from among the following (with agreement between the PC player and GM).

Epilogue A — Guardian. The PC remains in the domain and becomes its eternal guardian. Time passes but the PC does not age, appearing whenever the domain faces a crisis. They become a legend, and someday when someone drifts through the Spirit Realm again — this PC helps them.

Epilogue B — Journey. The PC leaves the domain — and makes a pilgrimage through the other hells. As one who has obtained the Mugen Path, they eternally continue the work of reflecting themselves in the mirrors of the other hells. The other PCs occasionally hear news of the PC.

Epilogue C — Dissolution. The PC gradually dismantles their own existence. They decide no longer to persist. The Mugen Path is an ability that "does not end," but the PC themselves can end it. This epilogue demands a strong declaration from the PC's player — but is a possible path.

Epilogue D — Becoming Mumyo. The PC inherits the role of the Avici being "Mumyo." The PC themselves becomes the new being at Avici Hell depth 5, eventually helping some future PC. This path is a form of character exit and the permanent fulfillment of a role in the setting.

---

#§ Expulsion Rule — There Is No Expulsion from the Mugen Path

The Mugen Path has no master and is not bound by specific conditions (principles · emotions · loss). Therefore there is no expulsion in the traditional sense.

However — if the PC's player explicitly declares "laying down the Mugen Path," the GM may, through consultation, cause that ability to be lost. This signifies the character's re-humanization. The choice to abandon the Mugen Path and return to human limits — is a powerful narrative moment.

After losing the Mugen Path the PC remains an ordinary 10-dan Tatsujin. Re-selection of one of the 3 Renown Title paths is not possible (practically meaningless since it is the campaign-conclusion period).

---

#§ Detailed Comparison with the Renown Title

#Effect Scale Comparison

#Narrative Position

The Renown Title is "the pinnacle of the story" — the PC reaching the mastery of their abilities, bonds, and role.

The Mugen Path is "transcendence of the story" — the PC taking a step away from the story itself.

Both paths conclude the narrative of a PC who has reached campaign's end, but the nuance differs. The Renown Title is "the pinnacle of humanity," the Mugen Path is "after humanity."

#Recommended Selection Criteria

The GM recommends a path suited to the PC's nature through discussion with the player.

---

#§ GM Operations Guide

#Timing to Propose the Mugen Path

• Immediately after the PC has experienced Avici depth 3 and returned alive
• The point at which 10-dan promotion is approaching (ordinarily, late Chapter 5)
• The moment the PC's player begins to be conscious of "this character's conclusion"

#Session Operations After the Choice

Sessions in which a PC who has obtained the Mugen Path appears — have some individual combat rules nullified. The GM, recognizing this:

1. Maintain threat balance among party members. Design so that threats are concentrated on the other PCs. Allow the Mugen Path PC to serve a "shield" role.
2. Dramatic staging of Time Distortion. Every time the additional action activates — describe time slowing down. This is dramatic staging.
3. Explicit signaling as the campaign-conclusion signal. From the session in which the Mugen Path PC appears, prepare the campaign epilogue. Refrain from introducing new boss-class enemies.

#Handling Time Distortion Interrupts

Whether the additional action can "wedge in" to block an enemy's attack — this determination is at the GM's discretion. The general principle is:

• Before the check result is revealed: Interrupt permitted. The PC may try to act first and attempt to nullify the enemy's attack.
• After the check result is revealed: Interrupt not permitted. The result is applied as-is. The PC acts in the next situation.

This distinction maintains the tension of combat.

#Managing Heart Shifts and the Mugen Path

Having heart shifts possible every round — is a burden for the GM. Declaring every time is cumbersome. Proposed simplification:

• Declare heart shifts at 1–2 "key check moments" per session
• Track the remainder automatically via the PC player's cumulative narration (player's own record)
• At the end of the session, the GM confirms the total and determines the direction

This approach maintains the narrative depth of the Mugen Path without breaking the flow of the session.

---

#§ Closing Words — The Endless Path

The Mugen Path — is, as its name says, "the endless path." Yet this "endlessness" is not eternal progress. It is the Absence of any sense of ending. There is a path and the PC walks it, but the PC does not know where they are, how far they have come, or where they are going. They have no need to know. They simply exist.

This is the enlightenment of Avici. And the one who has received this enlightenment with their body — is the practitioner of the Mugen Path.

"The pain is there. It simply cannot stop me. The end is there. There is simply no sense of it."

In the campaign's final session, when the Mugen Path PC stands on the battlefield — that PC is no longer part of the story. They are a being beyond the story. In the eyes of the party members who watch that being — reverence and fear are present at the same time.

This reverence, this fear — is the true staging of the campaign's end.

---

#§ Appendix — Frequently Asked Questions

Q1. After acquiring the Mugen Path, the character becomes so powerful that combat becomes meaningless. What should be done?

A. This is an intentional design. The Renown Title has the same problem. The solution: conclude the campaign. The Mugen Path is an ability for 1–3 sessions of the campaign-conclusion period — it is not intended for continued play beyond that.

Q2. The Mugen Path PC reached Wounds -10. Do they actually die?

A. They can die. However, this is limited to cases where the GM has intentionally staged it. In ordinary combat, reaching Wounds -10 is nearly impossible. If it has been reached — it is a signal that the GM "intends this campaign to end with the death of the Mugen Path PC."

Q3. What happens if there are 2 Mugen Path PCs?

A. Not recommended. As stated in §Critical Warning of this document, Renown Title/Mugen Path holders are limited to 1 per party. 2 or more destroys campaign balance. The GM must be clear on this point when designing the campaign.

Q4. The Mugen Path PC already has another hell school (Toukatsu-ryu · Kokujo-ryu · Kyoukan-ryu · Shonetsu-ryu). What happens?

A. It is irrelevant. Hell schools are technology up to the 4-pt secret art. The Mugen Path is a 10-dan special path. They are at a different tier. Both may be held simultaneously. In this case the PC — simultaneously possesses a specific-Finesse hell school + the Mugen Path at the existence tier. This is narratively enriching.

Q5. I want to continue the campaign without concluding it. Is it possible after acquiring the Mugen Path?

A. It is possible but not recommended. The GM may reference the main-campaign Renown Title appendix design notes "Play After Tatsujin" and attempt to zoom out to a war/politics scale, or introduce mythic-tier enemies for a scale-up. However, the Mugen Path PC's imperishability means there is almost no way to eliminate the PC at any scale — other than a narrative ending.

---

You who are reflected in the mirror of Avici — you do not end. Yet — whether that endlessness is salvation, punishment, or both, only you can know. From the moment you chose this path — you are inside the story and outside the story at the same time.

---

#§ Deep Appendix A — Narrative Continuity Between the Mugen Path and the Hell Schools

#Succession Patterns for PCs Who Already Hold a Hell School

If a PC already holds a hell school (Toukatsu-ryu · Kokujo-ryu · Kyoukan-ryu · Shonetsu-ryu), the experience of succeeding to the Mugen Path gains meaning as an extension of that school. The succession narrative for each of the four schools is summarized below.

Toukatsu-ryu → Mugen Path. The Toukatsu-ryu PC is a practitioner of "rising again." The Mugen Path is "no need to rise" — because they do not fall. The Toukatsu-ryu's repetition is sublimated into the permanence of the Mugen Path. The most naturally fitting succession narratively. The sword remains in their hand, yet even before lifting that sword the PC is already standing.

Kokujo-ryu → Mugen Path. The Kokujo-ryu PC is a practitioner "bound by principles." The Mugen Path is "the meaning of the binding is erased" — the technique works the same even without upholding the principles. The process of the Kokujo-ryu's principle structure dissolving away. The most dramatic shift narratively. Whether the fact that principles are not needed is liberation or nihilism for one who established those principles varies with the PC's interpretation.

Kyoukan-ryu → Mugen Path. The Kyoukan-ryu PC is a practitioner who "used emotion as fuel." The Mugen Path is "the Absence of emotion" — the technique is maintained even without fuel. This resembles the attainment of "power without boiling" that Yuji (有志) pursued throughout his life. Yet Yuji did not reach it — and the PC does. Narratively, the moment of surpassing Yuji.

Shonetsu-ryu → Mugen Path. The Shonetsu-ryu PC is a practitioner who "accepted loss." The Mugen Path is "even the sense of loss disappears" — a technique without a cost. The state of returning light (回光) was already effectively close to the Mugen Path. The moment the PC completes the path of returning light is the selection of the Mugen Path. The most philosophically consistent succession.

#The Case of Choosing the Mugen Path Without a Hell School

It is also possible for a PC to hold no hell school at all and select only the Mugen Path. In this case — the PC reaches 10-dan with Avici experience as their sole preparation. This is the "pure Avici" path and becomes the most extreme existence-transcendence.

However — a PC who has not undergone the gradual practice of a hell school may experience confusion at the speed of their self-change after obtaining the Mugen Path. The GM uses this confusion as drama within the session. "Yesterday I was an ordinary human. Today I am not the same being I was yesterday." This self-awareness is addressed in the PC's retrospective scenes.

---

#§ Deep Appendix B — Designing Enemy Mugen-Path Beings

#Enemy NPC Design Guide for GMs

For the campaign's final boss-class enemy (or a combat of comparable weight) — an enemy with effects on par with the Mugen Path can be designed. Such enemies are limited to 1 climax in the campaign and are not included in the baseline design of this expansion. This is a guide for cases where the GM intentionally adds one.

Design principles:

1. Symmetry principle. If a PC has the Mugen Path, a Mugen-Path-class enemy may also exist. However, do not give the same effects as-is — vary the interpretation.
2. Breakthrough possibility. The enemy's Mugen-Path-class effects must have a "Breakthrough condition." An enemy the PCs can never beat is despair, not drama.
3. Narrative reason. Why the enemy came to have Mugen-Path-class effects — must be explicable narratively. Example: "This yoma was trapped in Avici for centuries and escaped."

#Example Design — Lord of Absence (無の主)

A candidate for the final boss-class yoma of Drift of the Spirit Realm Chapter 5. The following is a reference design; GMs may vary it freely.

Combat against this enemy — even the Mugen Path PC cannot be complacent. The Breakthrough condition demands the party's accumulated knowledge, making teamwork essential. The Mugen Path PC "sustains to the end" while buying the party time to acquire knowledge.

#Mugen Path vs. Mugen Path Collision

When a PC's Mugen Path and an enemy's Mugen Path directly clash — in theory the combat never ends. Because neither side ends. The resolution of this situation is — narrative departure. One side must withdraw of their own will, or a 3rd factor (time, place, external intervention) must operate.

The GM can design this situation as the campaign's final scene. "You and they will fight forever. Yet — at a certain moment you realize. The reason the fight does not end is because you are not ending it." This realization leads to the PC's self-chosen action, and the campaign concludes.

---

#§ Deep Appendix C — The Player's Experience of the Mugen Path

#When the Player Is Roleplaying a Mugen Path PC

Roleplaying a Mugen Path PC is challenging. Because one must portray "one who does not end" in a human way. Some reference points:

Acting tip 1 — Do not make the Absence of fatigue monotonous. Not being fatigued does not mean having no emotions. Only the body does not tire; the heart still feels. Rather — precisely because the body does not tire, emotions may remain more vividly.

Acting tip 2 — Treasure conversations with other PCs. The Mugen Path PC is not physically isolated, but is in a state of existential isolation. Conversations with other PCs — become reasons for the PC to remain in this world. Casual jokes within the party, meal scenes, rest scenes — these small exchanges have a different meaning for a Mugen Path PC.

Acting tip 3 — Express the sense of floating in space. The Mugen Path PC's sense of staying in one place for a long time weakens. The sense of "being here" is hazy. Express this floating sensation in your roleplay — a moment of staring into the distance, a moment of calling a party member's name as if to confirm, a moment of holding an item and briefly forgetting.

#If the Player Finds the Roleplay Difficult

If roleplaying a Mugen Path PC becomes a burden for the player, they can simplify it after consulting with the GM. Without forcing extreme change, it is fine to portray the PC as "a somewhat detached human." What matters is that the technique's mechanisms function; inner roleplay gives way to the player's comfort.

#Emotion Management at Campaign Conclusion

Because of the design that Mugen Path selection = campaign conclusion, the PC's player experiences the emotion of "my character is about to end soon." This may be accompanied by disappointment or wistfulness.

The GM — respects this emotion outside sessions. If the player has strong opinions about their character's epilogue, those opinions are reflected. For the character's final session — the player's preferences are the top priority.

---

#§ Deep Appendix D — Party Consensus Items

#Questions to Address in Session 0

At campaign start — or at the point when 10-dan is approaching — questions for party members to discuss together.

1. "Which PC in our party is likely to select the Mugen Path?" (singular — 1 only)
2. "When the Mugen Path is selected, the campaign concludes within 1–3 sessions. Do you agree to this?"
3. "Of the Mugen Path PC's epilogue options (Guardian / Journey / Dissolution / Becoming Mumyo), which direction fits?"
4. "What will become of the other PCs' final campaign moments, besides the Mugen Path PC?"

Without this discussion — the campaign conclusion may feel abrupt. Even just sketching an outline in Session 0 reduces confusion in the later stages.

#The Final Moments of the Other PCs

The Mugen Path PC is not the sole protagonist of the conclusion. The other PCs also each have their own epilogues.

• A PC who obtained a Renown Title: The completion scene of their Renown Title
• Ordinary 9–10-dan PCs: The conclusion of each PC's own narrative
• A PC who married a domain NPC: The scene of settling in the domain
• A PC who begins a new journey: Farewell greetings

The GM must allocate epilogue time to each PC. Focusing on the Mugen Path PC alone risks burying the other PCs' stories.

#The Legacy After the Campaign

After campaign conclusion — the PCs' stories remain as legends in the domain. The Mugen Path PC is remembered as the "undying guardian" or the "sage who vanished." This legend can influence future campaigns (the same world, a different era).

At campaign conclusion, the GM — briefly summarizes the PCs' legends and shares them with the party members. This sharing — becomes the emotional conclusion of the campaign.

---

---

#§ Deep Appendix E — Detailed Combat Flow Example

#Scenario — Campaign Final Battle, 4-Person Party + 1 Mugen Path PC

Party composition:

• PC1 (Mugen Path holder) — swordsman, 10-dan, also holds Toukatsu-ryu secret art
• PC2 (Renown Title "War God" holder) — scholar, 10-dan
• PC3 (Renown Title "Sword Saint" holder) — swordsman, 10-dan
• PC4 (ordinary school — Tsuchimikado secret art) — onmyoji, 10-dan

Enemy: "Lord of Absence" — Chapter 5 final boss. Wounds 20, Defense 25. Holds 2 Mugen-Path-class effects (see §Deep Appendix B).

Round 1:

• Round start: PC1 (Mugen Path) Time Distortion auto-activates. 1 additional action prepared.
• PC2 (War God) start bonus: All allies gain +3 Energy.
• PC3 (Sword Saint) auto-hit attack → 2 Wounds to Lord of Absence. Defense counterattack auto-dodged.
• Lord of Absence counterattack: Powerful attack on PC3. PC3 Wounds reduced by 4 (possible halving from Sword Saint auto-dodge). PC3 Wounds driven to 1.
• PC1 (Mugen Path) activates Time Distortion additional action — relocates to protect PC3 + 1 attack on Lord of Absence.
• Roll: 2d10+Courage+Swordsmanship vs 25 → success. 1 Wound + Toukatsu-ryu Living-Blade Stance maintained.
• PC4 activates Tsuchimikado secret art "Celestial Observation" — learns the Lord of Absence's next breath action in advance.

Round 2:

• PC4 shares information; party adjusts tactics.
• Lord of Absence launches an ultra-powerful sensory erasure attack on PC2 (War God). PC2 loses 1 sense.
• PC2, despite sensory erasure — uses War God effect to continue supporting the party with squad infinite Energy.
• PC3 (Sword Saint) attacks again — Lord of Absence Wounds reduced by cumulative 5.
• PC1 (Mugen Path) — direct attack on Lord of Absence this round. 2d10+Courage+Swordsmanship+Living-Blade Stance +2. Success. 2 Wounds.
• Time Distortion additional action — relocates to protect PC2.

Round 3 (decisive):

• Lord of Absence Wounds ≈ 13. Still roughly half.
• PC4 determines the "true name of the Lord of Absence" from in-session clues → pronounces the name. Lord of Absence Mugen-Path-class effects paused for 2 rounds.
• PC3 (Sword Saint) auto-hit for 5 Wounds attack. Lord of Absence Wounds 8.
• PC1 (Mugen Path) — aims for timing to activate Toukatsu-ryu secret art "Revival Strike (復活の一劒)." Time Distortion additional action to attack — 2 Wounds.
• Lord of Absence Wounds 6. Counterattacks dulled (Mugen-Path-class effects paused).

Rounds 4–5:

• Party's combined attacks bring Lord of Absence Wounds close to 0.
• PC1's Mugen Path Time Distortion delivers the final blow — simultaneous strike by PC3 and PC1. Lord of Absence falls.
• Combat ends.

PC1 status:

• Starting Wounds 6 → ending Wounds -2 (entered negative; fine due to Mugen Path)
• After lull, Wounds recover to 1. Negative cleared.
• Heart shift accumulation: During this combat, PC1 used Time Distortion additional action 4 times, each with narrated motivation — "protecting party," "supporting ally attacks," "accelerating enemy elimination," etc. GM's total determination: Truth +2, No Heart +1.

Campaign epilogue connection:

• After battle, PC1 is "a little further away." The other PCs look at PC1. Everyone sees that PC1's shadow has become half-transparent.
• PC1's player chooses the epilogue: "Journey (B)." PC1 leaves the domain — deciding to make a pilgrimage through the other hells.
• Farewell scene. Campaign concludes.

#Notes on Other Party Compositions

• When there are 2 or more Renown Title PCs in the party: See §Critical Warning of this document. This situation is not recommended. The GM must adjust this in advance when designing the campaign.
• When there is only a Mugen Path PC and no Renown Title PCs: The other PCs in the party are ordinary 10-dan Tatsujin. There is a risk that the Mugen Path PC shines too exclusively. The GM intentionally highlights the other PCs' narratives further.
• When the entire party holds only ordinary schools: The Mugen Path PC's uniqueness stands out further. Their role as a campaign-conclusion signal is clear.

---

#§ Deep Appendix F — Mugen Path Technique Interpretation Q&A

Q. Is a "no-check action" (relocation only) also possible with Time Distortion's additional action?

A. It is possible. The additional action follows the same rules as an ordinary main action. Relocation only, conversation, observation, item use — all are possible.

Q. Does Infinite-Pain Endurance also apply to "instant-kill" techniques?

A. It does not apply. An instant-kill technique (e.g., a shinobi's Surprise Attack instant-kill) does not bypass "reaching Wounds 0" — it directly erases the existence itself. The Mugen Path's immortality is an exception to the Wounds rules, not to the existence rules. However, enemies who apply instant-kills to Mugen Path PCs are extremely rare — the GM sets these only as intentional drama.

Q. When Time Distortion's additional action activates during another PC's round, does that PC become confused?

A. Narratively they are confused. Mechanically there is no effect on the other PC. The additional action is "a moment when the initiative feels slowed to the PC" — it does not change other characters' initiative.

Q. What if the Mugen Path PC is imprisoned or sealed?

A. Imprisonment is unrelated to immortality. The PC does not die and remains alive even while imprisoned — they are simply imprisoned. Sealing requires a special GM-discretion technique. It is difficult to permanently seal a Mugen Path PC with an ordinary yoma's sealing technique. However, in special circumstances (a seal as a campaign-conclusion device), it is possible at the GM's discretion.

Q. Can the Mugen Path PC sleep?

A. Possible but not necessary. According to the basic change table (§Long-Term Effects) — after acquiring the Mugen Path, sleep needs gradually decrease. The PC player may choose whether or not to sleep. Even while sleeping, a sense of reality is maintained (a habit from one who has come from Avici).

Q. What about food?

A. Decreases but is possible. Can eat, and can taste. However, there is no decrease in stamina from not eating. Food remains for the PC primarily as meaning in terms of "connection with other PCs."

Q. What if the Mugen Path PC wishes to "re-humanize"?

A. See §Expulsion Rule of this document. The Mugen Path can be laid down via the PC player's explicit declaration. In that case the PC returns to an ordinary 10-dan Tatsujin. However — a portion of memory (the Avici experience) is retained.

Q. In long-term operations after the campaign, can the Mugen Path PC remain as a permanent NPC?

A. Possible and is one of the recommended paths. Epilogue A (Guardian) or D (Becoming Mumyo) corresponds to this. The PC becomes a being who assists the next generation as a permanent NPC. This remains as the legacy of the campaign.

Q. Is it possible to hold only one of the Mugen Path's three axes?

A. It is not possible. The Mugen Path is a "package path" and the three axes are not separated. This is the same as selecting one of the Renown Title paths as a whole. If only some of the three axes are desired — select the appropriate item from the main-campaign Renown Title (e.g., the Dharma King's incapacitation immunity is similar to the Undying axis).

---

Five mirrors, five fragments, and one transcendence. The hell school system of the Drift of the Spirit Realm is completed here. The one who turns the last page of this document — they are already on the path.