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Blow it up...

On the level Regret, just before ya get on the first lift. Take the stairs, go all the way up and kill the crazy grunt of the top of the stairs( some times he's asleep on the balcony). When you get to the top of the balcony, there is a FUEL ROD GUN!!! It has 6 (ish) of 25 shots left, but when you get to the Prophet's tower and you still have it with ammo, you can...BLOW UP EVERYTHING.
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