This is a pretty irrelevant request, but so far all the light subclasses have at least 2 supers and 2 melees to choose from. Void warlocks and hunters could use at least one more melee to balance things out.
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I think the heavy attack from revenant should serve as a 2nd melee option for nightstalker. Kills grant invisibility For warlocks I think it would be cool if they had a melee which creates a small blackhole in your palm and it sucks enemies within 7 meters, towards you and applies a life drain effect which heals you.