Kuwaq Yaku – The Forge DLC
Forge of Destiny Challenge Tomb (part 8)

Use the horizontal bar to swing over to the nearest ledge on the tower.

You're now headed for the sunny ledge above the carved head on the left (southeast) side of the cavern. You can't reach it directly.

So follow the ledges around to the other side of the tower...

...where you can once again enter a small room in the center.

Pick up a few supplies and use them to craft more fire arrows if you need them.

Jump onto the counterweight...

...to raise a ledge with a scoop outside the tower.

Let go and run outside through the doorway on the right. Immediately turn left...

...and shoot a fire arrow into the gas jet.

The explosion propels the ledge around and upward again. Turn around...

...so the tower is on Lara's right. Run along the ledges and jump onto the jutting ledge above the giant statue.

We made it, Dad! Lara discovers a gilded sarcophagus belonging to an important person. As Lara tells Abby about her find over the radio, climb the steps on either side of the coffin.

Examine the tomb stele to unlock the Grenadier Skill, which allows you craft grenades and launch them using any rifle.

After examining the stele, the tomb is complete. If you're playing the Echoes of the Past Side Mission, you're automatically returned to the tomb entrance in KUWAQ YAKU.