From Unofficial Ansalon Wiki
The Shadow clan also extends to the name of the 'Cult of Morgion'.
It's past in Ansalon's history is obscure for the most part, their intentions usually coming down to foiling the plans of both sides of the alignment chain without much care as to what the side effects are. The way of Morgion is the way of blight and corruption.
See also: Shadow Clanbook