Thlyy'gzul'zhaell: True name of a Changer of Ways, a Greater Daemon of Tzeentch. It can be presumed that at one point it has been encountered and defeated by Inquisitor Draco, since he mentions its name in the introduction to his Liber Secretorum.
Source: Draco by Ian Watson
Submitter: Simguinus
Hive World Terra