It is a large Nordic ruin that can be found by following the road through the steampools leading from the Imperial Mining Settlement. Upon first arriving on Wyrmstooth, Lurius Liore will lead the Dragonborn to the barrow with the other mercenaries. The barrow itself is split into three separate levels: the Temple, Refectory and the Crypt.
Before tackling the dungeon it is highly advised to stock up on equipment first as the barrow leads further down into Dimfrost, a large cavern similar to Blackreach making it far larger than a vanilla dungeon. A chute can be opened in the crypt allowing the Dragonborn to travel to Dimfrost and on to the dragon's den in the Dimfrost Luminatory.
A secondary exit can be found in the crypt by following the passageway up the stairs near the swinging blade trap, and will lead to an entrance along the coast behind the mountain, close to Haetar's Cave.
Alberthor can be found within Wyrmstooth Barrow. The Dragonborn will need to speak to him to open the second closed gate by allowing him to temporarily transfer your mind into a draugr. He will also provide the Dragonborn with two additional side quests.
Deeper in the refectory the Dragonborn will stumble across several fights between the bandits sacking the barrow and the draugr defending it.
- Spell Tome: Night Eye and Fade Other on table in Alberthor's alchemy lab.
- Spell Tome: Ease Burden and Ice Volley on bookshelf in Alberthor's sleeping area.
- Spell Tome: Transmogrify on a table in Alberthor's cooking area.
- Playable Flute on table in Alberthor's sleeping area.
- 3x Refined Brimstone in master-locked room adjacent to the alchemy lab.
- Spell Tome: Conjure Draugr Deathlord on a table next to a small burial urn.
- Spell Tome: Ice Volley on a table.