Extensions are optional rules that add to or modify mechanical behavior from those presented in the Core Rules. Most Content Packs rely on one or more Extensions.

They:

• introduce new systems, not new fiction
• define resolution methods, constraints, or affordances
• are setting-agnostic by default
• may be enabled or disabled independently

Examples:

• Equipment rules
• Hit locations
• Social conflict mechanics
• Vehicles
• Magic systems
• Sanity / Stress

Extensions never contain setting-specific lists or lore.

The GM shall determine which Extensions are in use for their game world. A checklist is provided that the GM can provide as a handout to players, so they are aware of which Extensions are in use.

The following Extensions are available in the current state of the game design as optional rules: