Edinburgh's Atragon deliver monolithic doom metal that draws power from sustained, crushing riffs and an unhurried approach to sonic devastation. Named after the legendary Japanese submarine, the band has been crafting their particular brand of heavyweight doom since 2012.

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.

Atratus channels folk and pagan metal from the Salzburg Alps, operating between Abtenau and Annaberg im Lammertal since 2024. Their mountainous setting in the heart of the Austrian Alps provides natural inspiration for compositions rooted in Germanic pagan tradition.

Kent metalcore act Atravion combine aggressive breakdowns with melodic guitar leads, building songs that shift between furious intensity and atmospheric passages. Active since 2012, they contribute to the UK's thriving metalcore underground.

Atrax Mantis — named after a genus of venomous spiders — has spun death metal from Kilkenny since 2008. From this medieval Norman city in Ireland's southeast, they deliver music as lethal as their arachnid namesake.

Atreides takes its name from Frank Herbert's Dune dynasty and channels power metal from Galicia's port city of Vigo since 2015. Their literary inspiration feeds epic compositions that echo the grandeur of their science fiction namesake.

Atretic Intestine delivers death metal from Turku since 2011, their medical-anatomical name signaling the kind of visceral brutality that defines Finland's goriest extreme metal. The project embraces the genre's most confrontational traditions.

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.

Atriell was a symphonic metal band from Varna, Bulgaria, formed in 2016 and signed to Amadea Music before splitting up. They brought orchestral arrangements and melodic metal songwriting to Varna's small but active extreme metal scene.