You disrupt the weave around a creature in range, who must be concentrating on a spell.At the start of each of the creatures turns, they take 1d8 force damage, as they weave pushes on them.If they stop concentrating on a spell, this spell ends, and they take 3d8 force damage, as their spell explodes in a burst of arcane energy.

At higher levels

When cast with a spell slot higher then second level, the damage dealt when they stop concentrating increases by 1d8.