I've done quite a few strikes with alot of people not using the weekly element singe for their subclass, I guess its because its they're favorite or its the optimal for the strike?
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Some cases, such as Well in void singe, for example. The dps of well would out do a nova. Plus the added heals is nice. Same goes with the other support supers (sorry hunters, not as strongly applied to you). I have my phoenix robes, and have a near endless well in a good team. Sorry, but that trumps any 15% buff singe. If it was burn 50% like old school, that's another story.