Elden Ring: Where to find the Serpentbone Blade

The Serpentbone Blade is a terrible weapon that can only be wielded by those who seek to harm others. This weapon has a fatal poison coating that builds up on opponents with each hit. This weapon has the double slash ability, which allows you to attack twice when in a low stance. You can perform inputs repeatedly to enable additional attacks.

You must first travel to Volcano Manor in order to receive this weapon. You must pass through the Altus Plateau to get to this place. Mt. Gelmir, in the northwestern region of the Altus Plateau, is home to Volcano Manor. The Grand Lift of Dectus or the dungeon that connects the Altus Plateau and Liurnia can be used to reach Altus Plateau. If you take the lift, you must first locate the Dectus Medallion's two pieces at Fort Faroth and Fort Haight. Volcano Manor is located at the summit of the mountain.

Take Tanith, the NPC who is sitting in the chair in the room where the Site of Grace is housed, inside the manor. She will give you the key to the Drawing Room. To get access to the enormous room down the hall, use this key. On the table in the room, there is a letter. Each of these messages will advise you to infiltrate an NPC's realm and kill them at a certain location. Rileigh the Idle is the second enemy you'll have to face. They may be found on Altus Plateau on the path leading to the Shaded Castle. Return to Tanith after defeating them, and she will give you the Serpentbone Blade.