I actually had a similar idea recently, like a large rift the size of Well of Radiance but instead of providing healing it would give the Jolt debuff to enemies that step inside, or maybe also pushes them away like a miniature hurricane/typhoon.
Your idea is pretty great, but it doesn't have to be on the loose, it could just stick around you like the Banner of War ability.
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I wanted it to be comparable to Silence And Squall. I like the idea of it sticking to the user. Maybe an exotic.