Cartoon Fall

Upon falling from a great height, be it by missing a jump, tripping or being knocked down, you can spend your reaction to transmute your physiology or that of a falling companion to that of a cartoon character and take the fall with no damage, in exchange for skipping a number of rounds of combat equal to the fall's height (1 round for 30 ft, 2 rounds for 60, 3 rounds for 90, etc.) The fallen creature is considered prone, but creatures have disadvantage on attacks against it and until the spell effect wears off, the cartoonified creature is immune to bludgeoning and force damage.

At the end of every round you may choose to roll a Wisdom saving throw to reduce the number of rounds you remain prone by 1. If you roll a Natural 20 on a Wisdom save, you get up immediatelly and get a free action, but no bonus action.