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[[File:SR-quest-A Daedra's Best Friend 04.jpg|thumb|right|Barbas throws himself at Sebastian Lort.]]
Located on the hillside in the northernmost corner of the map
. Rimerock Burrow can be tricky to find, especially if you approach it from the wrong angle. Take the road leading south from [[Skyrim:Lost Echo Cave|Lost Echo Cave]] and follow it as it twists and turns. At the crossroads, take the snowy path leading northwest and you will get straight to the entrance.
Inside, you will encounter a hostile [[Skyrim:Daedra|leveled atronach]], presumably created by [[Skyrim:Sebastian Lort|Sebastian Lort]] as an extra guardian. Sebastian himself can be found in the next room, equally hostile and will not hesitate to use his [[Skyrim:Conjuration|conjuration]] spells. After the battle, claim the [[Skyrim:The Rueful Axe|Rueful Axe]] from the table and examine the room for a bit of loot, an [[Skyrim:Arcane Enchanter|Arcane Enchanter]] and, on Sebastian’s night stand in the following room, the Conjuration [[Skyrim:Skill Books|skill book]] ''[[Skyrim:2920,_Hearth_Fire,_v9|2920, Hearth Fire, v9]]''. It is now time to return to Clavicus Vile in Haemar's Shame.
[[File:SR-quest-A Daedra's Best Friend 03.jpg|thumb|right|Barbas at Clavicus Vile's statue]]
Back at Haemar's Shame, the map marker will point towards the cavern entrance, which will force you to travel through the entire cave system once again. To circumvent this, head west up the road until the path bends. A pine is growing on the left, against the mountain wall; the back entrance is behind this tree below the top of the tree. Reaching the back entrance is fairly easy. If you reach the first piled up set of rocks on the left, you've gone too far. Inside the cavern, Barbas will once again sit in front of his master. When approached, Clavicus Vile has one final prank to play and will give you a choice: you can keep the Rueful Axe if you use it to kill Barbas. The dog will understandably jump up and try to tell you that it is not the only option available. Speak to Barbas and Clavicus Vile for further elaboration and make a decision. Kill Barbas and keep the Rueful Axe, or hand the axe to Clavicus Vile and receive his true daedric artifact, namely the [[Skyrim:Masque of Clavicus Vile|Masque of Clavicus Vile]]. Note that both items are unique, but only the Masque of Clavicus Vile counts towards the [[Skyrim:Achievements|Oblivion Walker]] achievement, so it is recommended to keep Barbas alive. Regardless of your choice, Barbas and Clavicus Vile will be reunited and you will receive your reward. Finally, return to [[Skyrim:Lod|Lod]] in Falkreath for a small amount of gold and his gratitude.