In a huge oasis/forest in the middle of a desert.
The elves were once infernal demons servants of a dark god who forced them to live in a hostile desert, as a way to strengthen their followers, some of the elves' ancestral infernal demons revolt against their god, thus generating a rupture, some chose to serve to a god of "light/nature", and the rest chose to continue serving the "sober god", the demons who chose to serve the god of "light/nature" were blessed with an oasis in the midst of the deserter as time passed , due to the influence of “light/nature” they lost the characteristics of demons and became what we know as elves. The "sober god" enraged at the betrayal orders his followers to destroy all traitors and so begins a holy war across the desert.