Psyclon Nine was a musical group formed in 2000 from San Francisco, California, United States. It was led by vocalist Marshall Goppert, under the stage name Nero Bellum. While their early efforts are generally categorized as aggrotech, later releases incorporated a disparate set of musical and aesthetic influences, notably black metal and industrial metal. They belonged to the so-called “second wave” of American harsh ebm / electro-industrial, along with bands such as Dawn of Ashes, Die Sektor, and Tactical Sekt. The group went on a hiatus at the end of 2010 due to Bellum’s opiate addiction, but returned to the stage in October 2011 for a performance in New York. After Rotny Ford and Jon Siren quit the band in March 2014, Nero Bellum ended Psyclon Nine. The name was a malapropism of Zyklon B, the trade name of hydrogen cyanide used in the gas chambers during the holocaust. The “Nine” was used because of the number’s significance in Aleister Crowley’s numerological writings.