The ruling wizards of the Anguis Imperium are formed into guilds, which can be identified by the color of the robes they wear.
- Blue Wizards – Battle wizards and specialists in evocation and destruction.
- Gray Wizards – Illusionists and mind readers.
- Red Wizards – Summoners and diabolists.
- Black Wizards – Necromancers and delvers into shadows.
- Green Wizards – Arcanists, sages and seers.
- Purple Wizards – Purple Wizards are the politically powerful members of the wizards council that have theoretically left their previous guild behind, gaining knowledge and secrets not known to other guilds. Wizards are only promoted to the council (which numbers in the hundreds) when there is a vacancy, which seems to be often caused by death, another fact that amuses Tiamat to no end.