Given that it's a Hive (or Hive modified weapon) it seems to me like it should do void damage, especially with the poisony thingy.
At least that's what I think, what do you guys think?
Edit: By "poisony thingy" I just meant the DoT, no idea if it's actually poison or a consuming darkness (or maybe rapidly growing cave moss) :P
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I don't see how you logically assigned void damage as the best candidate, but it wouldn't make the gun much better anyway.