Khronus
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A world made of fragments from long ruined realms, Khronus exists in the final universe in existence, mankind's final chance for redemption from the crimes that lead to the destruction of the former realms. Other planets that share this existence are Kraken, a life-bearing moon that orbits Khronus, and is called Alreni by the native races, and Deminos; a dark world at the edge of existence, orbiting a red sun that gives little light to the hostile world populated by races formed from Evil gods.
Homebrew spells and other information can be found here, updated as this world is converted from 3.5e to 5e.