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Brother Corhyn Questline
Brother Corhyn is one of the many NPCs you'll encounter that has a main quest to complete in Elden Ring. For this part of our Elden Ring guide, you'll find details of where to find him, how to begin and progress his questline, as well as how to complete it such that it unlocks one of the possible endings for the game.
At the Roundtable Hold
You'll first meet Brother Corhyn in the Roundtable Hold. Upon first meeting him you will not yet be able to progress his questline; you must first give him at least one prayerbook to activate his quest. During his time at the Roundtable Hold, you will be able to use him as a vendor for Incantations. After talking to him a few times, he says that he's considering leaving, to go out and find the noble Goldmask.
At the Altus Plateau
Once you've reached the Altus Plateau, Brother Corhyn will leave the Roundtable Hold; you can now find him near the waypoint where you can collect the Altus Plateau map fragment. Exhaust his dialogue here, then head north to find Goldmask, which is required to get Corhyn to move to his third location. Goldmask can be found on the broken bridge by the Road of Iniquity Side Path. To get there, go north from the Bower of Bounty Site of Grace until you find the Spiritspring located just north of the first broken bridge fragment. Orient yourself east and ride the Spiritspring up to land on the bridge to find Goldmask. Note that attempting to talk to him here has no impact on Corhyn's quest, as Goldmask doesn't actually speak.
Return to Brother Corhyn and tell him where Goldmask is. He'll tell you that he'll soon leave to go and find Goldmask himself. Return to the aforementioned bridge to find Corhyn and exhaust his dialogue here, as well as reactive him as an Incantations vendor.
In Leyndell, Royal Capital
You can find Brother Corhyn and Goldmask again when you reach Leyndell, Royal Capital. In the southwest side of the capital, by the Colosseum, you'll find Brother Corhyn and Goldmask. Speak to him and ask about Goldmask, and he'll tell you that they're working on solving the mystery of Radagon's true identity.
To help them, go to the Erdtree Sanctuary Site of Grace and climb up the tree towards the Queen's Bedchamber. Instead of taking the path to the Queen's Bedchamber, turn towards the golden roof on the left (just after you exit the door). Jump to the roof and head towards the open window.
Follow the balcony around until you reach a navigable tree branch; walk along that to circle back into the chamber where you found Godfrey, First Elden Lord (Golden Shade). Here, you should see a corpse on a chair suspended from the ceiling, with an item floating on it. This will give you the Golden Order Principia, which you must give to Brother Corhyn to progress his quest.
Purchase the Law of Regression
Once you've given him the Golden Order Principia, you'll need to purchase the Law of Regression incantation from him. It costs 10,000 runes and requires your Intelligence to be level 37.
If you don't have this, you can use Rennala in the Grand Library at the Academy of Raya Lucaria to respec using a Larval Tear (and respec back again if you wish, after you've completed the questline). Note that you will have to have beaten her in her boss form to be able to respec with her.
Once you have the incantation and your intelligence is level 37, go to the Erdtree Sanctuary Site of Grace. Take a left, heading west from here. Follow the path down and into the building, then take the lift to the bottom. From here, go down the first set of stairs and face the statue with its arms out wide to the southeast. Look for the glowing white message sign and interact with it to see this message: Regression alone reveals secrets.
Use the Law of Regression in front of the statue of Radagon to dispel the illusion hiding Radagon's alternate form. This will also unlock a new message, which reads as follows (NOTE: MAJOR ENDGAME SPOILER): Tap to Reveal. Return to Brother Corhyn and Goldmask and tell them of what you learned. Exhaust Brother Corhyn's dialogue here to get him and Goldmask to move to their next location.
At the Mountaintops of the Giants
Brother Corhyn and Goldmask will move to the Mountaintops of the Giants next. You can find them just south of the Stargazer Ruins, on the grass-covered bridge. Corhyn confides in you that he is beginning to doubt Goldmask. If you've completed the Rya Questline at Volcano Manor and still have the Tonic of Forgetfulness, you can give this to Brother Corhyn here to ease his misgivings. Note that doing so will not impact your ability to acheive the ending associated with Goldmask; it only affects Brother Corhyn's final location.
At Leyndell, Ashen Capital
If you did not choose to give Corhyn the Tonic of Forgetfulness, you will find him again in Leyndell. Upon defeating Maliketh, the Black Blade, you will automatically be returned to Leyndell, now covered in ash. Navigate south from the Leyndell, Capital of Ash Site of Grace until you see the larger helix spear protruding from the ash.
Corhyn is located at the base of this spear. Speak to him here to exhaust his dialogue, then reload the area to receive Corhyn's Robes and Corhyn's Bell Bearing. Here you'll also find Goldmask's body, but this time, at the very bottom of the cliffs. Interact with the body to collect the Mending Rune of Perfect Order. You can use this after the final boss battle, to unlock one of the alternative endings the Age of Order Ending.