The letter you brought me was written by a being who calls himself Nagaz, a member of the Argus Wake.  I don't know what this Argus Wake is, but if they're in alliance with the Syndicate then they must be a threat.$B$BI want you to find Nagaz and the Argus Shadow Mages mentioned in that letter.  I want you to find them, and kill them.$B$BSearch in the Uplands, where the Syndicate is strongest.  It is north of Strahnbrad.$B$BWith luck, you'll find these envoys of the Argus Wake there.