An injury reduces an entity's maximum HP, EP, and WP values by 2 + one-half the entity's level, rounded down. Or, see the table below for value-by-level.
If an entity's maximum base value for HP, EP, or WP is reduced to 0 or less as a result of injuries sustained, the entity dies. Base value refers to either the calculated total from a PC's role or the default entry on an NPC's card, prior to any modifiers from Gear or other effects.
PCs may recover from injuries by spending 1 Wealth within a properly-equipped town or city to heal. The cost is the same regardless of the number of injuries suffered. The cost and time required may change depending on narrative circumstances as determined by the DM. Recovery from injuries may also be offered as an occasional reward or bonus effect, either within a scenario or upon attaining victory.
While injuries can sometimes be obtained within a scenario, they're commonly acquired as a consequence of failing a scenario. For instance, PCs may be wounded while fleeing a losing battle. Injuries are also frequently obtained in exploration scenarios.