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The Helstorm Rocket Battery was inspired by a particularly impressive fireworks display. Early prototypes blew apart an entire floor of the Imperial Engineers School, but the soot-blackened Engineers persevered and succeeded in creating a deadly, if unpredictable, weapon. The shrieking rockets fired by this bizarre machine are wildly inaccurate weapons that have little chance of hitting anything other than (eventually) the ground. However, when these rockets do land on target, the results are devastating; entire regiments are blown apart by a series of earth-shaking explosions. After Elector Count Boris Todbringer was almost killed by an errant barrage, they were dubbed 'Helstorm' rockets after the colourful language used to reprimand the unfortunate crewmen.