In the Dark Times, the story of every life was set out before that life was even sparked. Every being was a puppet, destined to play its role without deviation and die in its appointed time. The great heroes Lixas and Luxas felt pity for the poor puppets, and destroyed the deity, consigning its name to eternal forgetfulness. All living creatures were given free will, to do with what they would.
Cults of The Nameless are common wherever people think order is preferable to chaos, but mostly as powerless as they are common. As long as the true name of this deity is never found, it can never assert any influence on the world.