func_nofalldamage
Introduction
func_nofalldamage is an invisible, non-solid brush
entity that prevents player fall damage when the center of the player’s
feet is inside its bounds at landing. It applies to all players
independently.
Passing through the volume while falling does not grant protection at a different landing location. Fall tracking resets after a protected landing, so a subsequent fall outside the volume causes normal damage. Landing sounds, PhD Flopper explosions, etc. keep their normal behavior.