By taking this essence, you are granted dominion over the calling of others.
You may manifest your soul or call upon the souls of the departed (all of whom are absolutely loyal to you) and give them weapons and armor.
You can summon various demons and forge their spirits into weapons/armor.
You may cause any artifact of power to appear before you.
You are given encyclopedic knowledge (with infinite memory) of all the spirits, demons, mythological creatures and artifacts in the multiverse.
You have the ability to bind anything you summon to you, so that it can never be lost or stolen.