Serathis: The Storm of Memory
Used to appear as a robed Inshon, and now shows up as some unknown beast. He commands a small army of Inshon beneath Stonepile Lake in the Slums. Has vast magical powers and deep knowledge of some things, but has the personality of a curious child. Seems to genuinely like the group, and often trades intel for stories, and has cast high level spells for the Stormfront before, for a price. Other adventuring parties also treat with him, and the League of Justice once tried (and apparently succeeded) in attacking him.
According to The Master (via his Steel-Gloved Assassin) Phargaryn was an attempt by a group of slassans to create a biological version of the Akashic Memory. Their attempt failed and he destroyed many slassin and dramojh before being trapped. After the fall of the dramojh he has broken free of his imprisonment and has developed a personality of his own. Said to be nearly indestructible.