Zhaitan

Zhaitan was the fifth and last Elder Dragon. Various living things and unliving things started to rot and decay with no where to pass over to. From these anomalies within Tyria, Zhaitan emerged.

With the lack of a plain that would take from Tyria as things reached their end of life, much like the Titans, Zhaitan transcended into another realm to create the Mists. A seperate dimension of space and time. There, various Realms started to form from Zhaitan's creation. Where the dead went and where the rotten are banned for causing turmoil.

Zhaitan being the original deity of the concept of death.

During its disappearance, caused most likely by the Maker, Zhaitan first selected Dhuum to inherit his spirit of death, however since Grenth proved the superior Protean, Zhaitan chose him instead. Grenth profits from Zhaitan's partial Ether pool.