Fall damage

Fall damage is a type of bash damage dealt by collision with an obstacle or a creature. It is not a special damage type per se, rather it's a category of special cased situations in regard to feather falling.

Fall damage is taken by any creature colliding with an obstacle - this may be due to falling into a pit, through a hole or chasm, being kicked or knocked back against a wall or a creature, or tripping and falling down. The damage taken differs based on the source, eg. falling down a hole causes 1d10 bash damage per floor traveled downwards, but is completely nullified should the victim have feather falling. Otherwise, fall damage behaves just the same as bash damage, including any applicable resistances, or for example Brittle Bones mutation and the associated vulnerability to bash damage increasing the fall damage taken.