Spectres of the Last War
The elves of Aerenal do not offer prayers to gods but to their own ancestors. And some of these are ancestors they can literally speak to, if they’re in the same room. To the Aereni, on lifetime isn’t long enough to complete their spiritual journey, and so they have mastered the art extending life indefinitely. The greatest of elves are given the Rite of Transformation, becoming an unliving being powered not by negative energy like the undead, but by positive energy including the worship of their descendants.
The Valenar elves worship only their deceased ancestors, and try to emulate one patron ancestor in every way. They do not seek to become undying. Rather, they believe elven souls are reincarnated over and over, and only by perfectly emulating their patron ancestor can they gain access to the memories and knowledge of all of their past lives.