you can only enter the armory twice, once for the story and once when marcus owns the armory. After that, the elevator into the armory no longer works. Howeevr, there is a unfixed glitch which allows...
no. but its recommended to have a high level because the enemies there are around level 50
second play through after finishing the game once
It's a DLC! Does not come with original game you must buy seperately.
No. If someone other than you knows the secret, it is no longer a secret, period.
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