Elusive

Once per round, either as a bonus action or as a reaction to an attack or a spell, you can teleport up to 10 feet. You can take the reaction after an attack or spell result has been determined, before damage is rolled. 

If the space you teleport to is already occupied by an object or a creature, you and the occupant of the space each take 2d6 force damage, and the spell fails to teleport you.