All Doubling or Tripling of damage refers to the basic damage rolled, not the injury done
In all cases, the target gets no active defense against the attack
Use this table on for critical hits to the head; face, skull, eyes
In all cases, the target gets no active defense against the attack.
Use this table only for critical misses on unarmed attacks (bites, claws, grapples, headbutts, kicks, punches, slams, etc.) or parries, including those made by animals.
Fighters that cannot fall down (e.g., snakes, and anyone already on the ground):
Treat any "fall down" result as 1d6-3 of general injury instead. Details are up to the GM - perhaps your opponent steps on you!
Fliers and swimmers:
Treat any "fall down" result as being forced into an awkward flying or swimming position with the same effective result (-4 to attack, -3 to defend).
Reference list:
Falling Down
Duration of Crippling Injuries
Irritating Conditions