Geothermal Valley - Climbing to the Cathedral (Part 1)

After picking up the relic, as shown in the previous section, continue up the stairs to the south. Use the horizontal pole to swing across to the next ledge, where you'll find some salvage.

Grapple-swing across the next wide gap and grab a handhold on the tower ahead.

As you climb around to the left and upward, the soldier on the ledge above talks to someone by radio.

If you wait until he's quiet, you can scramble up onto the ledge...

...and then sneak up behind him for a stealth attack. Open the box of supplies on this same ledge.

Then jump and grapple the ledge to the south, climb up, and follow the stairs to the top...

...where you'll find another document (29/33), Vow of Poverty from The Apostle series (Greek). Jump and grab the jutting beam ahead. Pull up.

Then scramble up the wall to grab the narrow stone ledge above. Climb around to the right and pull up into the archway.

Step out onto the red wooden ledge. Then grapple-swing across to the opposite doorway.

Climb the curved staircase and crack open the salvage crate at the top.

Step outside and look to the right to spot 2 enemies. If you've been emphasizing those bow skills and upgrades, you should have no trouble making headshots from here.