AI Limit has a total of 11 Firebearer’s Codex to collect for the Religious Scholar trophy & achievement. The Firebearer’s Codex function as text collectibles that give some small snippets of background information and can be sold to vendors for high amounts of Crystals. They are all found throughout the Hagios Patir area, with the first 2 able to be picked up in “Hagios Patir – Lower Level” early in the game, and the remaining 9 able to be picked up in “Hagios Patir – Upper Level” when you are there as the second last area of the game.
Collecting all Firebearer’s Codex is required for the trophy/achievement 
Religious Scholar – Find all the scattered pages of Firebearer’s Codex.
You don’t need to keep all of them in your inventory to earn the trophy, it is still unlocked once you have collected them all in a playthrough even if you sold some. It is recommended to hold onto all of them until you earn the trophy as you can’t track in-game which you have collected unless you keep them in your inventory.
Firebearer’s Codex
Below are listed in number order, but this isn’t the order they can be picked up in-game, they are distributed in a seemingly random order throughout the two areas.
Firebearer’s Codex, Part I
Branch: Hagios Patir – Lower Level > Cleansing Stairs (between entry portal and Branch)
Go back to the portal where you first entered the area from and instead of going to the right down the elevator, go to the left out onto a balcony. You can pick this up from beside a body.
Firebearer’s Codex, Part II
Branch: Hagios Patir – Upper Level > Faultage Corridor
Take the shortcut elevator between Faultage Corridor and Evolving Palace areas and jump off onto the platform that is halfway through the elevator. Follow the path sticking to the left to where you can pass a large mural on the right, and there is a square hole you can drop down to the left to reach a lower area. In this lower area go to the right past two ranged enemies and out onto a balcony where you can find this on a body.
Firebearer’s Codex, Part III
Branch: Hagios Patir – Lower Level > Cleansing Stairs
From the Branch go up the stairs toward where the large group of Pilgrims and Church enemies are, then follow the path all the way to the left. At the very end past the area where the first Sklarm interaction is (red circle) you can pick up the item by a body (green star)
Firebearer’s Codex, Part IV
Branch: Hagios Patir – Upper Level > Evolving Palace
From the Branch follow the main path until you drop down the ledges into the large open room, then continue to the left along the main story path. This is directly in the main path by a body that an enemy will be looking at.
Firebearer’s Codex, Part V
Branch: Hagios Patir – Upper Level > Evolving Palace
From the Branch follow the main path until you drop down the ledges into the large open room (Shirley is located on one of the ledges in her second last questline spot). Once you drop into the room itself turn to the right and look in the corner to find this by a body.
Firebearer’s Codex, Part VI
Branch: Hagios Patir – Upper Level > Faultage Corridor
From the Branch follow the main path until you hit a split near a big statue where you can go left or up a large set of stairs to the right. Go down the path to the left to a large room with a patrolling red hammer enemy (Part IX is located to the right). Continue into the next room and down the hallway to the right where the enemy casting the ground AOE spells is located. Pick this up from the body beside it.
Firebearer’s Codex, Part VII
Branch: Hagios Patir – Upper Level > Faultage Corridor
Take the shortcut elevator between Faultage Corridor and Evolving Palace areas and jump off onto the platform that is halfway through the elevator. Follow the path sticking to the left to where you can pass a large mural on the right, and there is a square hole you can drop down to the left to reach a lower area. Take the path leading to the left, going down the first set of stairs then left again down the stairs into a dead end instead of the path over the Mud Drawing Room. This is on a body in the corner near a human enemy.
Firebearer’s Codex, Part VIII
Branch: Hagios Patir – Upper Level > Evolving Palace
From the Branch follow the main path out a set of balconies with a long stairwell in between. When you go back inside go left to find a spot with two enemies and this sitting beside a body.
Firebearer’s Codex, Part IX
Branch: Hagios Patir – Upper Level > Faultage Corridor
From the Branch follow the main path until you hit a split near a big statue where you can go left or up a large set of stairs to the right. Go down the path to the left to a large room with a patrolling red hammer enemy and a few of the pyramid face enemies. You can pick this up from near a body on the ride side of the room as soon as you enter.
Firebearer’s Codex, Part X
Branch: Hagios Patir – Upper Level > Faultage Corridor
From the Branch follow the main path until you hit a split near a big statue where you can go left or up a large set of stairs to the right. Go up the stairs to the right (the main story path) then go into the room to the right where you can pick this up from a body.
Firebearer’s Codex, Part XI
Branch: Hagios Patir – Upper Level > Faultage Corridor
Take the shortcut elevator between Faultage Corridor and Evolving Palace areas and jump off onto the platform that is halfway through the elevator. Follow the path sticking to the left to where you can pass a large mural on the right, and there is a square hole you can drop down to the left to reach a lower area. Take the path leading to the left, then up the ramp on the right over the Mud Drawing Room. At the top where the two enemies are go to the right to a room with a Butterfly enemy. Drop off to the left where an enemy is and pick this up near a body.
For all other collectible types check out the AI Limit Collectible Guide.
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