This guide shows where to find Black Knife Assassin Secret Boss in Elden Ring. Finding Black Knife Assassin is part of Sorcerer Rogier’s questline.
Black Knife Catacombs
Go to the Black Knife Catacombs, which is in Liurnia as shown in the pictures below. In this guide, I will only show the quest-related activity. 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. Black Knifeprint is the item that you need for the quest. Go to the Roundtable Hold and give it to Rogier for the quest to progress. Click here for Sorcerer Rogier’s questline walkthrough.
