Istar Cairn-Breaker is a Nord warrior and a Commander of the Stormcloaks.
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He can be found inside a tent in the Haafingar Stormcloak Camp right next to Dragon Bridge, and can later be found in Castle Dour if siding with the Stormcloaks and completing the Civil War questline. As an essential character, Istar cannot be killed without the use of console commands.