So I was exploring the Dreadnaught. I think I was near the Court of Oryx. After crossing some disappearing bridges, Three enemies, each called [u][i]Blind Thrall[/i][/u] and level 36, spawned and chased me and my friend. These [i][u]Blind Thrall[/u][/i] were immune to [b]EVERYTHING[/b]! I did get a laugh out of it though :). Let me if you encountered them and/or if there is a way to kill them.
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There isn't a way to kill them. But that chest can be accessed by a cave with the chest of maggots and waiting in there for a while. Your screen will go green and then you'll get a debuff thing. Run and do the jumpy puzzle to get to that chest in 1:30 and I've heard it can be an exotic chest (it wasn't for me :( )