Personally, I think that Necrochasm needs a slight impact buff, and make it so that kills in general have a 50% chance to thrall explode. That way the gun might actually be useful.
What are your thoughts?
EDIT:
Also, bump so Bungie [i]might[/i] see this.
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More impact, larger magazine (at least 60 rounds). Also, you should get Cursed Thrall explosions 100% of the time, just like with the Firefly perk.