Cushion

The spellcaster may cast this spell as a reaction whenever the they are hit with an attack or effect that would knock them prone, or would move them more than 5 feet, or when taking damage from falling, or spells and effects that deal thunder damage.

A soft cushion of air surrounds the spellcaster. The spellcaster cannot be knocked prone, cannot be moved more than 5 feet, and reduces falling or thunder damage by half.