#Conversion Design Notes (IP safety · setting integration · 0.9.4 consistency)

Contents

#§ 0. Settling This-Expansion 0.9.4 Consistency (mandatory compliance)

This expansion 55, from 4 onward, enforces 100% compliance with the core 08-02 yoma bestiary standard and this expansion's 00-05 own mechanics 0.9.3 settled rules.

#0-1. Enforcing the Core Standard Stat Block

Every converted yoma uses the core 08-02 §stat-block format format:

Name (kanji) — Grade
Wounds X, Defense Y, Energy Z (Mob/Minion/Veteran have no Energy / squad order)
Courage+a, Finesse+b, Physique+c
Techniques: <technique name>[Energy, effect] / <technique name>[Energy, effect] / <defense technique>[reservation/improvised]
Special: [name] — [effect]
Domination +N

6 attributes only: use only Courage·Finesse·Physique·Wisdom·Presence·Fate. Invented attributes (Spirit, Psychic, Thought, etc.) are forbidden.

Check formula: 2d10 + attribute + proficiency ≥ Defense (core 03-03). Abstract "attack +N" notation is forbidden.

#0-2. Applying the Domination Conversion Formula

Consistent with the core 08-02 §Domination conversion formula:

#0-3. Damage Unit

Consistent with the core 00-05 §3. All damage a yoma inflicts on a PC is in Wounds units.

Principle: damage notation in the form "Energy -N" lacks rule meaning (core Energy auto-recovers each round). All damage notation is unified as Wounds ±N.

#0-4. Recovery and Energy Aid

Consistent with the core 00-05 §3 Category A·B:

Principle: core Energy is an action resource that returns to maximum automatically each round. Recovery/aid effects are handled as Wounds recovery or Energy aid according to their character.

#0-5. Multiattack → Cap of 2 per Round

Consistent with the core 03-04 §rule 3 + 00-05 §7:

D&D-original "3 attacks" or "5 heads at once" notation is forbidden.

#0-6. Non-corporeal · [Incorporeal] Attack Unification Rule

Mandatory application of the core 08-02 §Non-corporeal unification rule. All incorporeal yoma (zombie, wight, vampire, banshee, specter, yuan-gui, shi-hai, green-robe gui, night-gaunt, etc.):

Special: [Non-corporeal] — physical attacks negated on d10 1〜5 (50%). Exorcism Novice(1 point)+ exempt. `[Incorporeal]` attacks exempt. See [§Non-corporeal unification rule](../../co/co-08-gm-tools/co-08-02-monster-templates.md#비실체-통일-규칙).

For incorporeal attacks, the [Incorporeal] tag (§Defense/Pierce system) + §Exorcism exemption table link are mandatory.

#0-7. Critical Hit Notation

D&D-style Critical Hit notation ("1d10 = 9-10", "1d10 = 8-10") is forbidden. Use the core Critical Hit (2d10 double) or this expansion's 00-05 §15 Critical Expansion (adjacent faces 28%):

#0-8. Handling Outside Morale Effects

Consistent with the core 00-05 §12. The core defines only Cohesion (squad Cohesion). Morale is compatible only in the 1st campaign (domain morale) or when using the 30-03 variant:

#0-9. Stating the 30-10 Grimdark Dependency

Mechanical effects of madness, trauma, nightmare, mind shock, hallucination, and Fear depend on the 30-10 grimdark option or 30-03 variant B:

Campaigns that do not use it handle these as GM-discretion narration (no mechanical effect).

#0-10. Guide to Avoiding Collisions with Same-Name Core Yoma

Avoiding collisions with names already listed in the core 08-02 bestiary:

Principles:

1. Avoid using yoma names that already exist in the core bestiary.
2. When naming separately, use a source/culture prefix ("Chinese", "Shanhaijing", "Tibetan").
3. When integrating into the core, delete this conversion's material. Update the 99-04 integration index.

#0-11. Attack Bonus +5 or More · Instant Death Requires 2+ Limiting Conditions

Consistent with the core 00-05 §10. An attack +5 or more, or an instant-death effect, must simultaneously satisfy 2 or more of the following limiting conditions:

1. Stance/waiting accumulation
2. Designated target (prearranged, lifelong, ritual)
3. User Energy -N (self-cost)
4. Accompanied by an instant-death check
5. Justification/environment limit (night, stealth, mounted, rugged terrain, plain)
6. Critical-Hit-accompanied limit

This expansion's Red Dragon(+8), Blue Dragon(+7), Gold Dragon(+9), Archangel(+9), Guan Yu(+9), Dragon Kings of the Four Seas(+9), Basilisk instant death, Seraph instant death, green-robe gui instant death, etc., mandatorily add 2+ limiting conditions.

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#§ 1. IP Safety Review

#Public Domain vs Media Origin

#Alteration Principles

• Name: kanji or Korean alteration (e.g., Mind Flayer → Brain-Eater).
• Appearance: borrow the motif only. Change the exact appearance description.
• Abilities: convert into the core technique format. Original abilities as-is is X.
• State the source: an academic-citation format such as "Original: D&D Mind Flayer".

#§ 2. Setting Integration

#Placing into the Core World

A converted monster, in the core world:

• Spirit Realm: fits the 1st-expansion Spirit Realm environment (a non-mundane being).
• Outer reaches/foreign lands: fictional outer reaches beyond Japan (West, China, Arabia, etc.).
• Ancient ruins: mountain ruins, tumuli, caves.
• Outer-reach trade: a Nanban merchant ship brings it in by chance.
• Fiend influence: appears in Japan through contact with the 12 Fiend Classes.

#Differentiation from Core Yoma

Clarifying differentiation from core Japanese yoma:

• Core: traditional Japanese yoma (tengu, kappa, oni, onryo, etc.) + common-name Eastern yoma (Nine-Tailed Fox, nue, gaki)
• This expansion 55: fictional outer-reach monsters (conversions). When colliding with a same-name core yoma, integration into the core takes priority (§0-10).

A PC may meet both core yoma and this expansion's converted yoma. Distinguish them by differences in weakness/efficacy.

#§ 3. Conversion Balance

#Avoiding Conversions That Are Too Strong

• Mapping a D&D 16+ HD monster directly to a core Lord-grade overwhelms core PCs.
• A GM-discretion -20% to the values is recommended (depending on campaign tone/PC count).
• Attack +5 or more · instant-death effects mandatorily apply the §0-11 2+ limiting conditions.

#Avoiding Conversions That Are Too Weak

• An HD 1 monster is basically a Mob. Rather than solo combat, run it as a squad of 5 Mobs, traps, terrain, and alongside a higher-grade commander.
• To use it as the center of a solo encounter, declare a Minion variant separately. In that case, also set Wounds 1 · Defense 11–13 · whether it is a squad-order target.
• Recognize that a Mob = Wounds 0, no techniques, squad decoration. Basic humanoids like goblins and kobolds are standard as Mob squads.

#Special-Ability Balance

• Mapping a powerful original-D&D special ability (e.g., Petrifying Gaze instant death) as-is overwhelms PCs.
• Transform it to fit the core rules (e.g., instant-death check + Critical Hit + 2+ limiting conditions — §0-11).
• Multiattack must obey the cap of 2 per round (§0-5).

#§ 4. Matching the Campaign Tone

#Horror Tone

• 55-12 the Cthulhu series fits.
• The 30-10 grimdark variation is recommended (activates the madness/nightmare/trauma mechanics).
• §0-9 stating the 30-10 dependency is mandatory.

#Cinematic Tone

• 55-04 magical beasts/creatures (Pegasus, Unicorn) fit.
• The 30-11 heroic tone is recommended.

#Simulation Tone

• 55-02 Western basics (goblin, orc) fit.
• The 30-12 d10 stabilization modifier is recommended.

#§ 5. PC Prior Consent

• Horror-tone conversions: prior PC consent (introducing madness/trauma — §0-9 30-10 dependency).
• Heretical-thought conversions: possible conflict with PC faith/thought (e.g., a Catholic demon/devil).
• IP-safety conversions: all PCs are aware of the altered names (especially altered-name conversions).

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"Translation is dangerous. A wrong translation kills a myth. But a good translation keeps a myth alive." "Strictness is not cruelty. It is precision."