Gwaed Brun is located south of Echad Daervunn in Enedwaith. This is where Tûm, an elder of the derudhs of Enedwaith, conducts his rituals. There is an altar here that will open a portal to the Huntsman's Hall if you have completed Shards of Light.
Related quests that start or are found in this area include:
Related quests that involve this area:
-  The Elders