Exposure 10G
Complete Chapter 2.

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You'll start with nothing but your glaive, and will gain the ability to grab far off ammo or weapons with the Steal ability. You'll find ammo crates with pistol ammo which you can use, and feel free to pick up weapons from the enemies, although they can only be used for a short amount of time before deactivating. You'll encounter the Collossus on this mission, but can't kill it. Just use the guards' guns to fire at it until it runs and make sure to dodge the rocks it throws as well as its charge attack.