There was a roleplay system which had their illusionists done up in a similar style. Like they were all a bit mental and with Illusion being the magic of controlling and abusing reality they looked like they were abusing their spells too much.
With Frostgrave you can use anything, and stuff like that's a great find. Do they already have an apprentice as well ...or is the Apprentice some misshapen blob who failed at their experiments (or succeeded)?