When we complete the second Letter from Volcano Manor, talk to Recusant Bernahl to get Letter to Bernahl.   (For details: Tanith Questline)

Open the map and come to the red mark position.

After defeating BOSS - Vargram the Raging Wolf and Errant Sorcerer Wilhelm, we got Raging Wolf suit.

Vargram the Raging Wolf - Elden Ring Raiders

Errant Sorcerer Wilhelm - Elden Ring Raiders

Return and talk to Recusant Bernahl to get Gelmir's Fury.