Atramentum is a black and doom metal band from Hamburg, Germany, formed in 2017, whose name derives from the Latin word for ink, evoking the darkness and permanence of their heavy, slow-burning sound. The band merges black metal's atmospheric hostility with doom's crushing weight from Germany's second-largest city.

Atrexial is a Barcelona-based blackened death metal force signed to Non Serviam Records, exploring themes of spirituality, cosmic dimensions, and demonology. Across albums like "Souverain" and "Gargantuan," members Naga S. Maleström, Louen Walden, and Belegurth have built a reputation for intense, technically accomplished extreme metal.

Atritas were a symphonic black metal band from Basel, Switzerland, active from 1997 to 2014, releasing their material through CCP Records. Their three studio albums — "Where Witches Burnt" (2004), "Medium Antigod" (2007), and "Celestial Decay" (2009) — combined Satanic and anti-Christian lyrical themes with the orchestral grandeur typical of the late-1990s Scandinavian symphonic black metal wave.

Atrium Noctis is a melodic black metal band from Cologne, Germany, formed in 2018, whose releases include Blackwards and the track Leviathan, delivering epic symphonic black metal with bombastic arrangements, profound dispatching, and atmospheric dark sections. The band brings cinematic grandeur to the Rhineland's extreme metal scene.

Atrocidade merges black and death metal from Lisbon since 2013. Their Portuguese name meaning 'atrocity' delivers exactly the horrors promised through over a decade of extreme metal from the capital.

Atrocious Command is a black/death metal band from Bruges, Belgium, operating in the underground extreme metal scene with a sound that draws equally from the aggression of death metal and the dark atmosphere of black metal. The band has released material through their Bandcamp page as an independent act.

Atrorum is a progressive black metal band from Munich, Germany, active since 1998, pushing the boundaries of black metal through complex song structures and unconventional compositional approaches. With over a quarter century of activity, the band represents the long-running experimental edge of Bavaria's black metal underground.

Atroth practices black metal from the shores of Lake Balaton in Balatonfüred, a resort town more typically associated with summer leisure than satanic hostility. Formed in 2019, they bring an incongruous darkness to one of Hungary's most picturesque settings.

Atrum conjures black and death metal from Hafnarfjörður, a harbor town just south of Reykjavík, since 2019. Their Latin name meaning 'dark' anchors a sound steeped in the volcanic shadow of Mount Helgafell.