Falling

When you fall more than 5 feet, take bludgeoning damage equal to half the distance you fell. If you take any damage, you land Prone. If you fall into water or a soft substance, calculate damage as though the fall were 20 feet shorter, 30 if you intentionally dove in (up to the depth of the substance).

Falling on a Creature

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 Success The creature takes no damage.

Success The creature takes bludgeoning damage equal to one-quarter the falling damage you took.

Failure The creature takes bludgeoning damage equal to half the falling damage you took.

Critical Failure The creature takes the same amount of bludgeoning damage you took from the fall.

Falling Objects

A dropped object takes damage just like a falling creature. If the object lands on a creature, that creature can attempt a Reflex save using the same rules as for a creature falling on a creature. Hazards and spells that involve falling objects, such as a rock slide, have their own rules about how they interact with creatures and the damage they deal.

Section: Playing the GamePathfinder Player Core pg. 421