The White Mask helm is part of the War Surgeon set, which belongs to White Mask Varré, who you encounter in Limgrave at the start of Elden Ring ... want to complete the quest offline.

The rose church quest consists of an encounter with the NPC called White Mask Varre. He is also your first NPC encounter in Elden Ring. White-Faced Varre is located near the first Site of Grace ...

The Lord of Blood’s Favor is a Key Item in Elden Ring that can be used to progress ... Bring the bloodied piece of cloth back to White Mask Varre to progress his questline.

The Marais Mask is a Helm in Elden Ring. It is part of the House Marais Set alongside the Marais Robe. Mask in the image of a white-haired young noble. Customarily worn by the head of House Marais.