So, I like the idea of having that extra perk on the Necrochasm... But I think Cascade is a pretty lame choice. It's situational at best and I think with the Necrochasm buff coming... Cascade should be replaced with Feeding Frenzy. Not only would this be a much better option, get used much more, but also it just sort of seems to fit the weapon to a tee.. Seeing as the Necrochasm lore is all about feeding on enemies and stuff. I mean.. Before you get the crux it literally talks about a hunger that grows after every meal.
Tldr ; replace Cascade with Feeding Frenzy on the Necrochasm.
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or create a new that increases the impact for every time the gun reloads