Hang from the edge and release to grab the handhold below. Traverse to the right until you reach the stone beam.

Pull up and jump to grab the opposite handhold. Shimmy left and release to grab the lower handhold. Jump back to land on the stone beam and jump to the next one.

Jump to perch on the pillar and jump to grab the handhold on the opposite wall.

Shimmy right and jump to grab the next handhold above. Again, shimmy right and jump to grab the ledge. Pull up and pick up the Treasure (21/30).