Dark Transport

You forge a short-lived dimensional gate that slices through your opponent. If you wish, you can leap through the gate and take his place while banishing him to the spot you were just in. You target one creature in range and they do a WIS saving throw. If they fail, they take 5D10 force damage and you can swap places with the target. If they succeed, just half damage and no swapping places. If you have a pact with the Celestial:  After swapping places with the target, you can teleport a number of squares equal to your CHA modifier