time for level 12!

Adverse Interactions Reaction Feat 7

General Skill
Prerequisites master in arcana

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If you know how it works, you can know how it doesn’t work! Once per day, when an arcane spell is cast that you can see and are aware of, you can attempt a counteract check. If successful, you prevent the spell from being cast and the caster loses the spell slot as if was cast.

Thoughts?