If a creature falls from a height greater than anumber of feet equal to 10 + that creatures acrobatics bonus, they take a die of bludeoning damage equal to the Size Damage Table for every 10 feet they fell. The amount of damage dice caps out at 30.

Size Damage Table

Size Size (in sq) Die
Gargantuan ≥16 squares No damage
Huge 9 squares d4
Large 4 squares d6
Medium 1 square d6
Small less than 1 square d6
Tiny less than 1 square No damage