tbh Blast Nova could really use it as well.
I actually liked the idea of Supernova + Arcane Explosion combo attacks. Probably broken as hell if it knocked back, but some form of interaction would be amazing to make Arcane more PvP viable. Maybe it suspends enemies if you Supernova'd them for a few seconds? Kind of a floating root - so people can still cast, but can't run away or LoS. That'd be cool visually and would give Arcane a much needed PvP boost.