Essence of the Underworld
By consuming the essence of the Underworld, you gain several boons:
Master of the Underworld: You become the master of the Underworld, the keeper of all that is imprisoned and bound there. While in the Underworld, you are immortal and invincible, able to freely teleport anywhere within it. If killed, you will resurrect in your palace after a day.
Luxurious Palace: You have a palace at the center of the Underworld filled with all the luxuries you could ever ask for. From your throne room, you have an omnipresent view of the Underworld and can see through or control any being trapped there.
Elemental Manipulation: You can detect, manipulate, or conjure any element found in the earth, particularly metals, in massive amounts. You are strong and durable enough to survive brawling with beings like the Hekatonkheires and drag them to the Underworld.
Opening Doors: You can open doors to the Underworld anywhere, whether by conjuring massive doors or cracking the earth. Permanent gates can be established and locked down at will.
Profane Chains: You can summon infinite amounts of indestructible profane chains in various ways. These chains can restrain gods, suppress powers, and drain abilities if left attached. They can drag targets into the Underworld and trap them there for eternity, and can also target souls. Powers return if the chains are removed long enough. You can manifest objects like daggers, claws, or bear traps on the ends of the chains.
Command Over Inhabitants: The inhabitants of the Underworld are bound to your commands and cannot rebel or twist your orders. Any soul not taken to a specific afterlife or destroyed winds up in the Underworld. Copies of objects, vehicles, ships, or even cities can sink into the Underworld if enough death is involved in their destruction. You can fill your Underworld with anything meeting these prerequisites, loaded with the legends and history from your world.
Summoning the Damned: You can summon anything subjugated to the Underworld by opening a door and calling them forth. If killed, the damned being will be pulled back into the Underworld and resurrected where they were interned. The profane chains will always drag them back to the Underworld, even if they reach another realm.