This guide shows the complete questline for Sorcerer Rogier in Elden Ring.
Meet Rogier in Stormveil Castle
The first time you will meet Rogier in Stormveil castle. You will find him inside a chapel north of Rampart Tower as marked in the picture below.
From the Rampart Tower Site of Grace, go out through the north door. Jump down on the wall on the east side. Then jump further down on the wall going north. Move ahead in this path and enter the tower ahead. Then turn left and enter the chapel. Here, you will find Rogier next to the altar. He won’t be there if you have already killed the area boss, Godrick. Rogier will sell you sorcery spells.
Defeat the Secret Root Monster Boss in Stormveil Castle
Root Monster will spawn only after you have defeated the area boss, Godrick. Defeat Godrick, then make your way to the Liftside Chamber as shown below.
From the Liftside Chamber, go out the door. Then turn around and go in the west direction till you reach the edge. Here, you need to jump shown to the lowest level as shown in the second picture below.
After reaching the bottom, proceed ahead towards the south then turn right and drop down. Here you will face the secret Root Monster.
Kill the Root Monster and go to the room behind it. Here you will find some bloodstain on the ground. Interact with the bloodstain and you will see the projection of a dead body as shown below.
Talk to Rogier in Roundtable Hold
After you have defeated Godrick, Rogier will move to the Roundtable Hold. Go and talk to him about the corpse under Stormveil Castle. He will tell you that it was the face of Godwyn the Golden, who was killed by a black knife assassin, long before the shattering of the Elden Ring. You will get Rogier’s Rapier +8 after talking to him.
Note: If you talk to Ranni before finishing the questline, then Rogier will die.
Talk to Fia and get Knifeprint Clue
Go and talk to Fia in the Roundtable Hold. Let her hold you and exhaust all her dialogue options. She will give you a Knifeprint Clue, which will tell you the location of the Black Knife Assassin.
Black Knife Catacombs
Go to the Black Knife Catacombs, which is in Liurnia as shown in the pictures below. Click here for the complete guide of the Black Knife Catacombs.
After entering the black Knife Catacomb, proceed in a linear and eventually, you will reach a room where you will see three large blades moving up and down. If you look above on the left side, you will see a platform. You will have to use the moving blades to reach the platform on top. When the moving blade goes down inside the ground, stand on top of it as shown in the pictures below. The moving blade will carry you to the top. When the blade has reached the top, jump to the platform as shown in the pictures below.
Continue in the path until you reach the last room. Hit the wall in front as you enter the room. Hitting the wall will make it disappear and reveal an orange mist wall as shown in the pictures below. Here you will find the Black Knife Assassin Secret Boss. Defeat him to get Assassin’s Cerulean dagger & Black Knifeprint.
Give the Black Knifeprint to Rogier
Go back to the Roundtable Hold and give the Black Knnifeprint to Rogier. He will tell you that he needs to study it and will ask you to come back later. Reload the area talk to Rogier again. He will tell you that his examination is complete and he has found that Lunar Princess Ranni was behind this. He will ask you to speak with Ranni to find out whether Ranni truly is the one who plotted the assassination.
Go and Meet Ranni
Go to Ranni’s Rise as marked in the pictures below and talk to the Witch Ranni. She will ask you to leave. Report back to Rogier and he will recommend you to become one of Ranni’s Vassals. Go back to Ranni. This time she will allow you to become one of her vassals, starting Ranni’s questline.
Ending: Get Rogier’s Armor Set
Go back and report to Rogier. He will tell you that he is worried he will fall into a deep slumber. Then he will die after some time. You will get Spellbalde’s Armor Set from his body. You will also get Rogier’s Letter, which will give you some information related to D’s questline.