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 wouldn't imagine it to be poison but more like a bleed considering it's named Thorn and shoots dagger sized thorns out of the cannon.