The gods may rule, but death is the only one to take people forth and back.

Destroyer's origins:
In the beginning of time there was one god, one universe.
He got bored and made another 7 gods.
All of these 8 universes were infinite.
God number 8 consumed his universe.
He is the destroyer.
He then consumed 5 more of the infinite universes.
One of the remaining gods decided to separate his universe into an infinite amount of finite universes.
The other found an element created by the 8th devil to kill the destroyer.
It kills gods, so gods can not touch it.
He put it in his universe and fought against the destroyer to buy time for someone to discover it and use it to beat the destroyer.
Enter the Alchemist.