The Outriders Forgotten Chapel secret side quest is one of the last objectives you'll complete that isn't tied to the main story, but if you're looking to avoid spoilers, you'll be better off bookmarking this patch for later on. You can complete the Forgotten Chapel side quest in Outriders when you reach (and complete) the Canyon of the Grand Obelisk region of the map, so if you've not made it to that point yet, don't worry about this – you'll get there eventually. If you have done everything there and you've still not completed this secret side quest, read on for a complete Outriders Forgotten Chapel walkthrough.
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Outriders Forgotten Chapel secret side quest walkthrough
In order to complete the Squaretasking trophy/achievement (complete all side quests), on top of all the Hunter and Wanted contracts, plus the myriad side quests you can pick up from NPCs in the world, you need to find the Forgotten Chapel quest. This is the only Outriders secret side quest in the game, but since it doesn't appear as something to actually complete on your HUD, it's easy to miss.
The entire Outriders Forgotten Chapel side quest takes place in the Canyon of the Grand Obelisk region, which comes after the Desolate Fort in the desert section near the end of the game. To complete the quest, you need to find and activate three small pillars.
The first pillar is to the left, immediately after you leave the cave your allies have set up camp in. Rather than going up the short staircase ahead of you, take a left and follow the rocky path to the end. Interact with the glowing blue pillar at the end to tick off the first one, in the Canyon Entrance section of the map.
Push up the aforementioned stairs next, kill all the Perforos that appear, then go through the next gate. Rather than going straight on, up more stairs to another circular gate, take a sharp right. You'll know you're at the right junction because there's a dead human slumped beneath a brazier by the stairs towards your main objective – you want to go up the other stairs to the right. Keep climbing more stairs until you enter a huge ceremonial room with a loot crate at the back. Interact with the second pillar in the middle of the room for the Forgotten Chapel quest.
The third and final pillar is right at the end of your time in the Canyon of the Grand Obelisk. Keep heading forward until you make it inside the obelisk, then after the cutscene with Tiago and August – but before you climb back up the stairs to the entrance – head to the back of this area and climb the other stairs opposite the way you came in. At the very top of here will be the last pillar. This will trigger the Forgotten Chapel quest in your log.
Once you've cleared all the enemies in the main quest objective and finished exploring Monroy's camp, you can switch to the Forgotten Chapel quest which just says "Explore the Forgotten Chapel". In order to find the Forgotten Chapel, head back to the Cliffside Path section of the map. Chances are you spotted the door when you fought your way down here the first time – you can now interact with the pillar in front of the doorway with three glowing symbols.
Head inside and congrats! The Outriders secret side quest is complete and you'll be given a free legendary weapon. Not too shabby for just hitting three buttons.