Mountain Temple - Pyromaniac Lantern #3 and Other Goodies

TOMB RAIDER screenshot
Return to the front of the building where you just shot the 2 enemies. Now head around to the left side of it.

TOMB RAIDER screenshot
Hanging from the far corner of the building is another lantern (3/5) you can shoot for the challenge.

TOMB RAIDER screenshot
Walk across the fallen tree.

TOMB RAIDER screenshot
Turn right and scramble up the wooden wall behind the building.

TOMB RAIDER screenshot
Inside, on the upper floor, there's a trunk full of salvage plus more arrows.

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