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|quote = '''''"Promethium is the heartblood of the [[Imperium]], pulsing through its great engines of war and commerce, expanding Mankind's realm with the regularity of a drum. And when it is spilled, it burns away all the impure with the heat of our hatred."'''''

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The term also commonly refers to the substance used as fuel for Imperial [[flamer]] weapons, a highly volatile incendiary gel which immediately ignites on contact with oxygen. It reaches super hot temperatures. Similar to [[napalm]], the gel sticks to an individual, continuing to burn on its own accord, even underwater and in space.{{Fn|1}} It also fuels most spacecraft and vehicles, both military and civilian.{{Fn|1}}

[[Image:PromethiumBarrels.jpg|thumb|right|150px|Promethium Barrels{{Fn|5}}]]

Promethium is extracted and refined in a number of different ways. Some of the most common methods are extracting it from the atmospheres of gas giants, the mining of ancient organic material deposits, the processing of certain rare ices that are only found on [[Ice World|ice world]]s, or from beneath a world's seabed thanks to [[Promethium Rig]]s.{{Fn|2}}{{Fn|3}} The [[Imperium]] stores the fuel in Promethium Barrels for later use or so that it can be transported elsewhere.{{Fn|5}}