Conrad's temporal warp

You create a warp in the fabric of space and time that only you can access. You take only half as much damage from the triggering attack, and you vanish into an impenetrable, tiny demiplane. Nothing can enter this demiplane without the use of a wish spell whilst you are inside it. At the start of your next turn, you reappear at a spot up to 30 ft. away from where you were when you vanished, and gain resistance to all damage except psychic damage until the end of your turn.