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They are used in some miscellaneous quests, and can be used to make the spell tome of Conjure Storm Atronach in the Atronach Forge in the Midden in the College of Winterhold. Ysolda asks for one during the Rare Gifts quest.
- On mammoths and sometimes on Giants.
- Inside certain areas within cities and other settlements.
- A few can be found in Halted Stream Camp.
- One can be found on a table next to the entrance of Snow-Shod Manor, Riften.
- In the bedroom within Black-Briar Meadery in Riften.
- Atop a shelf, behind the counter of The Bannered Mare, Whiterun.
- In the room to the left of the front entrance in Jorrvaskr.
- In the basement on a shelf in Black-Briar Lodge.
- A short way into Uttering Hills Cave.
- In a chest in the bedroom of Old Hroldan.
- Can be bought from Lucan Valerius (Riverwood Trader).
- Can be bought from Ysolda if she is married.
- Three can be found in The Arcanaeum.
- One can be found in the Hall of Countenance on one of the dressers.
- Buy one from the Hunter just north of White River Watch.
- An upstairs room chest in The Drunken Hunstman in Whiterun. Taking it is a crime.
- The mammoth model have carvings on their tusks that disappear when taken as an item.