Thermal and light casters can make a killing as a team creating halls of mirrors that mess with peoples heads :) I think they must love Halloween.
Very well thought out, and I also think there won't be too much to thermal casters they are sheer natural power.
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Indeed, teams of casters are known for doing these kinds of things, though it usually requires teamwork earned through extensive practice before hand to be truly effective. Though it can get kinda chaotic when I try to write a battle scene involving many different casters, I think the excitement of the resulting action sequence is usually worth it.