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A '''Promethium''' is a chemical compound similar to napalm used by in the [[Imperium]] in [[Flamerflamer]] weapons, '''Promethium''' . It is a gel that sticks to a personan individual, and will continue to burn, even under water. It When refined it is used to run many forms of vehicles and it is also a major fuel source within and outside the Imperium. Most races are known to use Promethium - exceptions being the [[Necron]]s and [[Tyranid]]s. When refined it is used to run many forms of vehicles.