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Isohedrus is an evil white dragon. The Wafflecrew had just escaped Barovia and were wandering in a blizzard. They spotted Isohedrus and took shelter in a lodge.[1]

Much later, when the group came to the frost giant village of Kronenheim, they fought Isohedrus. Artus Cimber turned the dragon into an ice statue with flesh to ice.[2]