You study wide range of magic specially summoning magic. You decided to summon your link deity when you feel confident to do so. As you do, You summon a 3 guardian entity. Osiris(grim reaper), Hanniel(angel) and Astaroth(demon) are in front of you waiting for you to choose.

The choosen diety step in and the other goes back to their respective dimensions

"So you've chosen me.."