Convergent Time Strike

You create a doorway into the nexus of timelines and then vanish. Choose up to five creatures you can see within range; they are attacked by "copies" of you from different timelines that discharge temporal energy into the target(s). Make a melee spell attack against each target. On a hit, a target takes 8d6 necrotic damage and must make a Constitution saving throw. On a failed save the target is stunned until the end of your next turn. Alternatively, you can choose to attack only one target, increasing the necrotic damage taken on a hit to 12d6.

You then teleport back to the space you cast the spell from, and the "copies" return to their timelines.