Injuries

Broken bones, bleeding, impaired vision, and so on. Often much more realistic about receiving damage than other games, even though often these can be healed on the spot regardless of the nature of the injury. Simplest and least interesting case for these are slouch and slower movement speed due to the amount of damage taken.

Definitely applicable when this extends to all creatures/units regardless of the side they're on in the conflict, but not if the main character(s) are immune to them while their enemies aren't.

Implied: (not enforceable)
* Graphic violence

Related:
* NPC injuries
* Dismemberment
* Anatomic damage
* Damage modeling
* Bleeding
* Pain - using an injured limb should cause pain.
* Scarring
* Imperfect healing