Hipfire grip is useless on a pulse rifle. It makes no sense why it has that perk in the first place when nobody hipfires with a pulse. Give it a different perk like encore or eye of the storm. Make the hipfire grip intrinsic to it just to replace the full auto perk on it since full auto fire is already part of the options in the game.
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Move Hip-Fire grip to the intrinsic. Then maybe, at maximum stacks of String of Curses, hits siphon health and ability energy from targets. The health and energy return I’m thinking something along the lines of what Child of the Old Gods gives. Then maybe also just have the catalyst give +15 Range