Rebel's Cairn is a cave located in western Skyrim between the Sundered Towers and Bleakwind Bluff. Inside is an alchemy lab, the body of a dead adventurer with a copy of The Legend of Red Eagle, and a pedestal with a weapon slot.
There is also a copy of the skill book Reality & Other Falsehoods.
- Find Ring of Pure Mixtures for Frida, one possible location
- Salty Sea-Dogs, one possible location of Fine-Cut Void Salts
- Unlock the secret of Red Eagle's Tomb