Atavus is a black and death metal band from Mainz, Germany, formed in 2022, combining the atmospheric hostility of black metal with death metal's guttural ferocity. The band's name, Latin for 'ancestor,' suggests a connection to primal, ancient themes within their extreme metal framework.

Atavysm is a one-person instrumental melodic black metal project from Hamburg, Germany, formed in 2013, whose name derives from 'atavism,' meaning evolutionary throwback. The project's releases include the self-titled 2013 album and the 2020 single Farvann, channeling dark, depressive, and melodic elements through purely instrumental compositions.

Ateiggär are a Zürich black metal duo formed in early 2019 by Fauth Temenkeel and Fauth Lantav, both active in the Helvetic Underground Committee and linked to acts such as Ungfell, Kvelgeyst, and Arkhaaik. Their debut EP "Us d'r Höll Chunnt Nume Zyt" (2019) and debut album "Tyrannemord" (2022) channel mid-1990s Norwegian black metal with lyrical themes drawn from Byzantine history and alchemical mysticism.

Atelophobia creates post-black metal from Västerås since 2024. Named after the fear of imperfection, they channel that anxiety into atmospheric compositions that embrace the beauty of flawed creation.

Atem fuses black and death metal from the northern port city of Kemi since 2017, drawing from the extreme cold of the Bothnian Bay. Their brief, breath-like name captures the gasping intensity of their dual-genre extremity.

Atemtor is a black metal band from Dusseldorf, Germany, active since 2000, making them one of the veteran acts in the Rhineland black metal scene. With over two decades of activity, the band has maintained a persistent presence in the German underground.

Formed in 2011 in Tirana, Albania, Aten play old-school death metal with a straightforward brutality that keeps them rooted in the genre's classic conventions. Their 2014 debut album Horns of Evil established the band as a rare standard-bearer for extreme metal in the Albanian scene, and they have continued releasing material into the 2020s with Stars and Anvers.

Atenoux are a Vienna-based project operating under the lafilledesastres Bandcamp imprint, blending black metal aggression with gothic and symphonic sensibilities. Their music draws on the dark romanticism of the French black metal tradition — Atenoux itself being a Gaulish word for "inner darkness" — crafting melodic, emotionally intense compositions that favour atmosphere over brutality.

Atentado delivers grindcore from Lisbon since 2011. Their Portuguese name meaning 'attack' or 'assault' drives blastbeat-laden compositions of compressed violence from the capital.