Slapping on face paint, spikes, leather and assuming the ominous names of Lord Ornias (vocals), Diabolus Erysichthon (guitar), Flesh Harrower (drums) and Azaethron (bass), Teratism adopted atmospheric backdrops of music and Gregorian overdubbing into their basic old-school Black Metal music, ala Emperor and the like. The double peddling, wailing guitars and raspy vocals would commence on their self-titled debut release published in 2001, the same year of their founding. That album was followed-up with Ex Infernus in 2002, and Invocatum Furae Diabolus in the summer of 2002. By the time their Blessing Of Death was being created for release in 2004 the line-up had shifted to see the departure of Azaethron, and the inclusion of Umbriskus (guitar) and Jergmingand (bass) but by the time the album was released the membership had assumed new monikers of Wrath (vocals), Murder (guitar), Desekrator (guitar), Scorn (bass) and Void (drums). For the album's part, it featured standard old school Black Metal along with a killer version of Kreator's Tormentor as a bonus track. In 2005 Mike (ex-Ascendancy; guitar) took over the bass slot for their feature on the Destroyers From The Western Skies compilation.
In 2008 they would release a joint venture with Lugubre titled Templi Omnium Hominum Pacis Abhas. Pure Unadulterated Hate full length album also came in 2008, followed by Via Negativa (2010) and La Bas (2013).