Nexus Being

You exist in every universe, and are able to tap into these other universes and interact with them freely. With this ability, you can summon an alternate version of you.

In combat, the alternate acts during your turn. It can move and use its reaction on its own, but the only action it takes is the Dodge action, unless you take a bonus action on your turn to command it to take another action. That action can be one in its stat block or some other action. You can also sacrifice one of your attacks when you take the Attack action to command the alternate to take the Attack action. If you are incapacitated, the beast can take any action of its choice, not just Dodge.