Opening BMSB... searching for appropriate spells...
What system, pray tell, is this OP? BMSB is D&D 3.5, so if you're running 4e, M&M, etc., I don't want to waste my time copypastaing and instead think up original stuff.
Type - Necromancy [Cold] [Electricity] [Fire]
Level - Sor/Wiz 8
Components - V, S
Casting Time - Standard Action
Range - Medium
Target - Ray
Duration - Instantaneous, Permanent
Saving Throw - No, Will Negates
SR - Yes
This spell launches a bolt in the shape of a red circle, a blue triangle, and a yellow square that surround the target and erupt in a flash of energy. The creature immediately takes 2d6 each of fire, cold, and
electricity damage. The creature must then make a Will Save or be permanently petrified. Only a wish, limited wish, miracle, or similar magic can reverse this effect.