All jokes aside, I think Nechrcocasm is probably the hardest. I've heard 4th Horseman was pretty hard to get, too.
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I got one for each of my first 2 times completing CE....my friend didn't talk to me for week after the second one dropped. Lol
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Lucky bastard.
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Sad part is they both sit in the vault until I'm bored. I don't shotgun...usually.
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4th Horseman ascends all shotguns. It is a god among those weaklings. Easily the fastest TTK in the game. [spoiler]plus it looks sexy as hell [/spoiler]