There are a few extra items that you’re able to find in the library (i.e.
letters) but they aren’t mandatory.
Reach the library’s upper floor.
Find the book presented in the picture above.
This will trigger a cut-scene.
Another damaged wall can be found on the floor.
Use the axe to reveal a new quote.
Go back on the ground floor.
Look at the biggest mural (Heron and Eclipse).
Press the interaction button to trigger a cut-scene - the mural gets destroyed and it reveals another one.
The next step is to find the cross.
Go to the room located on the opposite end of the library.
Use your axe to destroy the part of the wall presented in the picture 1.
This reveals a large cross (the picture 2).
Picking it upunlocks a secret passage to the crypt.
This unlocks further passage.
Jonah helps Lara to climb up.
By doing that you areable to redirect light on the Virgin Mary’s statue.
This unlocks another passage.
you’ve got the option to turn it to change the place where the light is being casted.
You have to direct the light on thefresco of a woman.
Approach the fresco and pull the lever.
This unlocks another passage that leads to the next station (the fifth one has no puzzles).
Start by reaching the one located on the left from the entrance to this room.
Approach the lever near that scene and pull it.
Reach the spinning wheel located on the right from the entrance to the room with the cross.
Approach the lever and pull it.

This is the end of the puzzle.
Ix Chel chest is in the next room.
This also unlocksThe Chosen Onetrophy.
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