Vex Mythoclast
While you did nerf it rightfully so, you went way too far with it. You've touched PVE when it wasn't necessary, you've made the gun completely unworthy of the effort to get, who cares to get this gun now when you have Hawkmoon or literally anything better.
Thorn and Bad Juju
... again, we're still waiting.
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You're kind of beating a dead horse with Thorn, Bad Juju and the mythoclast but I do agree that there could be a little bit more transparency about the time frames on these things.