Come to the guest room and get Red Letter.

Open the map.    Come to the red mark position and select Yes.

After defeating the boss - Juno Hoslow, Knight of Blood, we got Hoslow's suit and Hoslow's Petal Whip.

Juno Hoslow, Knight of Blood - Elden Ring Raiders

Return and talk to Tanith, Volcano Manor Proprietress to get Taker's Cameo.