Karstaag's Skull, Legacy of the Dragonborn

Glacial Cave on Solstheim, wedged into the ice wall at the back of the cave. The quest item for the unmarked quest 'Summoning Karstaag'. The display accepts both the original and the replica, but the original is turned in during the quest, so only the replica can be displayed. You only need to have had the item in your inventory for the replica recipe to be unlocked. Made at the Replica Station in the Curator's Office with the following materials: 3 Bone Meal 2 Clay

Skyrim:Summoning Karstaag - The Unofficial Elder Scrolls Pages (UESP)

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Karstaag's Skull, Legacy of the Dragonborn

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