|The following information is from the Adventure Time comic book series. It may not be part of the same canon or continuity as the animated series.|
|"Do you know what Ice King means?!"|
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A heated salt crystal is a magical item used by the Ice Queen. When inserted into the body, it leeches off all body heat and absorbs it into itself. When placed into a fire elemental, such as Flame Prince, the crystal will eventually draw out all their heat, and they will evaporate into nothing.