This whole series has some great custom side effects for wizards who favor certain spells. Could also be used for long term side effects for a bad spell casting roll.
Originally shared by Courtney Campbell
Rounding out the end of this series, though I doubt anyone will find themselves using spells of this level with any frequency. . .
http://hackslashmaster.blogspot.com/2014/04/on-effects-of-magic-8th-level.html