Dimensional slice

Move action. Provokes. Self. Your action. As a primary action make a melee attack roll, and an invisible dimensional blade extends in a chopping action. On a successful hit, a slice of your target briefly shifts to a dark dimension, but does not re-integrate when it returns. You opponent slides apart in two pieces (or their shield, or sword or arm if they parried). Target is Killed. If you Crit, You kick the target in half and the gateway forms long enough that you can jump into it to escape If you desire; you reappear D20 rounds later.