The super charge ability radiation for sun singer on the warlock needs to be a bit more powerful. It's just not very good compared to the nova bomb. If it was enhanced, it would make radiation a much more useful ability.
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When you want something to be improved, it's called a 'buff'. A 'nerf' is when you want something toned-down. :P OT: I don't really see anyone use Sunsinger in PvP, since the Nova Bomb is always a better choice.