Falling on a Creature
Source Player Core pg. 413
If you land on a creature, that creature must attempt a DC 15 Reflex save. Intentionally aiming yourself to land on a creature after a long fall is almost impossible.
Critical SuccessThe creature takes no damage.
SuccessThe creature takes bludgeoning damage equal to one-quarter the falling damage you took.
FailureThe creature takes bludgeoning damage equal to half the falling damage you took.
Critical FailureThe creature takes the same amount of bludgeoning damage you took from the fall.