Okay the first curse is an awesome weapon in the right hands but it needs a impact buff. If it could be able to two shot head shot someone in the crucible it would be a great weapon to use in both PvE and PvP. The only times I've found it good in the crucible is when you are playing defensively because aggressive play style with this archetype of hand cannons is not that great in the meta right now. If you want diversity in the crucible, buff the impact.
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I like to get the First Curse buff active and then switch to special and heavy weaps.