Dalladin

 Dalladin was who all Bright Ones strived to be. Intelligent, powerful, just and merciful. He was the proudest of them all, but pride is often accompanied by a downfall, and such was the fate of the Brightest of them all. His light flickered and waned until all of his Brightness died. He fell from grace, and with it the Agonizing Realms were spawned.  

From the Tome of Creators, written by Unknown