The Phurba Thogchag is the ninety-fourth treasure that can be found in Uncharted 2: Among Thieves.
The Phurba Thogchag is found in Chapter 25 - Broken Paradise. When all is finally quiet, the player can work their way to the crumbling ruins at the top of the courtyard. After arriving, the player can jump up on top of the pile of rubble, and shimmy their way leftward using the outer facade of the platforms. When able to pull themself up from the rubble, so that they are on the catwalks overlooking the previous courtyard, the treasure can be found hanging off of one of the statues in the vicinity (more specifically, a statue on the left, if the player is facing the rubble below). After shooting it down, the player should grab it once it hits the ground.