The Mission to AMC-421 was a minor event in the Cruentusian War. It occurred when Herich Stimmlur, a former affiliate of the Sinyan Imperium who had defected to the Necasian Military, was tasked by his new masters to investigate the remote asteroid mining colony of AMC-421 of treason. Eventually, his suspicions led him to deactivating the colony's life support and purging it of life.