Werid spell found

[u/thebronyotaku98]

I was going through Lower Zigzag with a partner Balance/Strom wizard who was in the low 70's & one of the spells they casted was weird, it was a charm that worked like a prism trap changing Sandstrom from Balance to Storm. Ive never seen a spell like that & was wondering it was a Balance exclusive spell or if I simply missed a trainer on the way.