In my opinion, the darkness subclasses (Stasis, Strands) are really cool, but it would be very appealing (and fair) if they received variations in their supers, since they are the only ones that have only one super option. An improvement in this aspect would make these subclasses much more attractive.
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I know it sounds lazy but a well like thing for warlocks but instead of healing is had much greater dmg resist and slowed/froze enemies that entered it (or that could be an exotic)