Conjure greater being

When you cast this spell your tattoo of you're patron or draconic ancestor erases from your body (taking 2d6 physical damage), and from your tattoo, your patron or draconic ancestor appears above you, (if the patron let the dm make a stat block if draconic ancestor uses the ancient dragon that you chose), the patron or ancestor will do whatever the player says, example.

Player: hades is going to kill the ogre.

dm: how?

Player: by doing whatever a god does.