Trag'Oul

Trag'Oul is a character that we have limited info about. This is known so far: [1]

For lore fans who read the Diablo: The Sin War trilogy, it seems Pardo slipped acknowledgement that there are other worlds out there. Trag’Oul was halted from helping the inhabitants of Sanctuary by other guardians such as himself who were watching over other worlds. They warned Trag’Oul the fate of Sanctuary would affect or benefit the fate of other worlds. So if you thought this was a Heaven vs Hell conflict with Sanctuary in the middle of the sandwich, you are wrong. There are more worlds than meet the eye.