I'm trying to play as a Mage but some units are immune to magic. Where can I buy a 'Conjure Flame Atronach' tome?
I strongly suggest, that you join the Mightyy.. College of WinterHold.
Travel to Winterhold by carriage.., Go to the bridge, and talk to the woman, she will give you the Flame of Atronach, Magelight, or Fire BOLT spell, at a mere 30 Gold! Once your in you can learn any spell you please, and do exciting quests.
You can purchase it from:
- Calcelmo (at Understone Keep, Markarth)
- Falion (resident wizard of Morthal)
- Farengar Secret-Fire (court wizard at Whiterun)
- Madena (court wizard at Dawnstar)
- Nelacar (living in the Frozen Hearth inn at Winterhold)
- Phinis Gestor (a mage at College of Winterhold)
- Sybille Stentor (court wizard at Solitude)
- Wuunferth the Unliving (court wizard at Windhelm)
- Wylandriah (court wizard at Riften)
You can also create the "Conjure Flame Atronach" tome at the Atronach Forge (The Midden, College of Winterhold).
Source: UESP wiki's "Conjure Flame Atronach" article