Call of Cthulhu

Skryrún supports Call of Cthulhu with a stat block form built around CoC's characteristics, derived values, and percentile skills. Both monsters and NPCs use the same stat block form — the distinction is in how you use them at the table.

Select Call of Cthulhu in World Settings → Game System to enable CoC-native stat block creation.

Setting up a conflict

CoC does not use encounter building in the same way as combat-focused systems. There is no difficulty budget or initiative tracker by default — conflicts are usually brief and brutal. The workflow focuses on having the right stat blocks at hand.

Create a Monster or NPC entity for the creature or antagonist. Open it and add a CoC stat block.
Fill in HP, sanity loss range, and at minimum one attack entry. These are the values you will reach for most during the conflict.
Optionally create an Encounter entity to group the participants and write the scene setup. Use the encounter's description field for environmental details, objectives, and escape conditions.
In session mode, open the relevant stat block entities. Sanity loss and attack values appear at the top of each card. Track HP manually in the notes or the stat block's HP field.
When the conflict ends, update any NPC status changes in the post-session debrief.

💡Tip

For investigation-heavy sessions, lean on the Clue entity type rather than stat blocks. Prepare clue entities set to GM Only and flip them to Party at the table as players discover them. See Visibility and secrets.

Stat block fields

Characteristics

Field	Full name
STR	Strength
CON	Constitution
SIZ	Size
DEX	Dexterity
INT	Intelligence
POW	Power
APP	Appearance
EDU	Education

HP and sanity

Field	Description
HP	Hit points — tracked in combat
Sanity loss	The sanity loss range for encountering this entity, e.g. `0/1d6`

❗Important

Fill in the sanity loss field for every creature your players might encounter. It appears prominently on the stat block card in session mode so you can reference it instantly without scrolling.

Attacks

Each attack entry has:

Field	Description
Name	e.g. Claws, Bite, Tentacle Grasp
Damage	Damage formula, e.g. `1d6 + DB`

Add as many attack entries as the creature has.

Skills

A list of investigator-facing skill rolls the entity uses — the skills players are likely to roll against or reference. Enter the base skill percentage for each. You can also add custom skills for setting-specific or mythos abilities.

Encounter display

CoC adversary cards show: system badge + HP. CoC does not use AC or level, so the encounter tracker reflects that — HP is the primary tracked value in combat.

Monsters and NPCs

CoC uses the same stat block form for monsters and NPCs. Use the entity type (Monster vs. NPC) to signal how you intend the encounter to play out — the stat block structure itself is identical either way.

💡Tip

For named antagonists and recurring NPCs, pair the stat block with a full entity page — include background, connections, and secrets in the article body, and keep the stat block for quick combat reference.

Practical use in session mode

The two things you reach for most during a CoC session are sanity loss and attack stats. Both are displayed at the top of the rendered stat block card so you do not need to scroll mid-encounter.

For investigation-heavy sessions, use the clue entity type alongside stat blocks. Set clue entities to GM Only visibility until players discover them, then flip to Party at the table. See Visibility levels for how information reveals work.