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Ismark is the brother of Ireena, and the de facto Burgomaster of Barovia after the death of their father. He met the Wafflecrew and introduced them to his sister, and pleaded with them that they help him get his sister away from Barovia, to safety.
He accompanied the Wafflecrew for a time, until the events of Old Bonegrinder. After the battle with the hags, Ismark accompanied the stolen children back to Barovia, ensuring the Wafflecrew that he would keep them safe.