I don't know. It seems like a rather suggestive nickname for something a simple as a swamp-dwelling lunatic. I'm actually more interested in finding out where The Deceiver got the nickname; Source of the 500 Poisons. He never used poison in the game, and although his 'persuasion' could be a poison of sorts, it doesn't explain the 500 bit. Maybe M3 will go a long way to explaining more about Bahl'al, Myrdred and Ravanna. And Damas. And Balor/Connacht.
Anyone else think we might even learn more about the nameless Fallen Lords?
LR