Zyklon-B was a supergroup, where his members were higly known musicians such as Frost, Ihsahn("Emperor"),Samoth("Emperor") and  Draug Aldrahn("Dødheimsgard","Thorns"). They recorded an "EP Blood Must Be Shed" and two split "Blood Must Be Shed / Wraths of Time", "Necrolust / Total Warfare" and split-up at 1999.