To me Handheld Supernova seems like a pretty skill-free ability - kind of like a close range, area of effect fusion which can be held indefinitely. That being said, I haven't used attunement of fission yet so I don't have any firsthand experience with it. I'm interested in what particularly people who use it (in Crucible) think of its ease of use / effectiveness.
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If u r a skilled player u r possibly not holding on to it long any way so I don't know if that's a necessary change. But, I could be wrong as I haven't gotten to play with it yet.