Falling

A creature that falls takes 3 (1d6) bludgeoning damage at the end of the fall for every 10 feet it fell, to a maximum of 70 (20d6) bludgeoning damage. When the creature lands, it has the Prone condition unless it avoids taking any damage from the fall.
A creature that falls into water or another liquid can use its Reaction to make a DC 15 (Athletics) or DC 15 (Acrobatics) check to hit the surface head or feet first. On a successful check, any damage resulting from the fall is halved.