Vyssothys

A "heretic" among the mindflayers, for reasons unknown. From limited interaction with mindflayers, heresy/heretics seems to be related to the use or study of any magics. He could perform a ritual that could absorb powers of the God Touched, similar to Caeryn.
Carries a deep hatred of the adventurer Thol, whom he connects to the one known as Estel of the OsterRats.
Eventually, he met his end at the hands of the OsterRats.