Falling
Generic Hazard
A creature that falls takes dice:1d6|noform|noparens|avg (1d6) Bludgeoning damage at the end of the fall for every 10 feet it fell, to a maximum of dice:20d6|noform|noparens|avg (20d6). 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 Strength (Athletics) or Dexterity (Acrobatics) check to hit the surface head or feet first. On a successful check, any damage resulting from the fall is halved.
Source: Player’s Handbook (2024) p. 367