Board Thread:Suggestions forum/@comment-26767096-20160328154721/@comment-26322120-20160328165201

First, Angbad was not in the Grey Mountains, it was stated to be in Northern Beleriand (which as you said, sank.) Second, they were kinda've crushed by a dragon. Angbad was not like Utumno, in that it was without a doubt destroyed entirely. You could possibly make the argument that Angbad had some other entrance (possibly as far east as the Grey Mountains), but. The Thangorodrim. Were. Destroyed. Completely. Even if it did somehow survive, I don't think any Balrogs would still make there home there. Also, I don't think it could serve much more purpose then Utumno.

Now that I'm done with my rant (and it's nothing personal, I just don't think Angbad should be added) I will say that I wouldn't mind seeing some of the features you described being added to Utumno, such as the loot, werewolves and vampires. (Did werewolves and vampires exist in the time of Utumno?)

@StormMancer Morgoth actually used werewolves and vampires.