Atroz is a heavy and progressive metal band from Juiz de Fora, Minas Gerais, with roots going back to 1998 under various configurations. Their self-titled 2021 release on Bandcamp marked a renewed presence, and the band draws on a range of heavy and progressive influences rooted in the fertile Minas Gerais metal tradition.

Atrymo is a death and black metal band from João Pessoa, Paraíba, formed in 2017 by members with roots in prior extreme metal projects. The four-piece — featuring Aracélio on drums and vocals, Ivan on bass and vocals, Ivaldo and Bruno on guitars — channels themes of human hatred, greed, and spiritual corruption through tracks like "Sentidos Infames," "Miséria e Ódio," and "Depressão," with lyrics sung in Portuguese.

Attma is a death and groove metal band from Parnaíba, Piauí, active since 2020 and part of a small but growing extreme metal community in Brazil's northern coast. They blend the rhythmic heaviness of groove metal with death metal extremity, operating independently in a state better known for Teresina's scene than for coastal metal activity.

Attomic Soldier is a thrash metal band from São Paulo, Brazil formed in 2017, carrying forward the city's tradition of aggressive, crossover-flavored thrash. Their 2017 debut album "In Mental Prison" is a nine-track assault covering themes of war, insanity, and darkness, showcasing the raw, high-speed aggression typical of the São Paulo underground scene.

Aume is an atmospheric folk black metal project from Vicuña in Chile's Coquimbo region, created and performed entirely by Averso Yekamush. The project weaves Andean folk traditions into a black metal framework, and their 2020 debut album Fulgor Renegrido — a nine-track record described as a pilgrimage through Chilean earthly and mythological imagery — received a limited cassette release through Ancient Entity Records in the UK.

Aura Scent is a death/thrash metal band with progressive elements hailing from Osório, Rio Grande do Sul, Brazil, formed in 2021. Operating in the extreme underground of southern Brazil, they blend the aggression of death and thrash metal with progressive song structures, a combination relatively rare in their coastal Rio Grande do Sul home city.

Auro Control is a progressive power metal band from Salvador, Bahia, Brazil whose debut album "The Harp" (2024, Rockshots Records) fuses melodic power metal with progressive depth and Bahian percussion. Produced by Thiago Bianchi (Noturnall, ex-Shaman) and featuring guest appearances from Jeff Scott Soto, Aquiles Priester (W.A.S.P., ex-Angra), and Felipe Andreoli (Angra), the record announced the quintet as one of Brazil's most ambitious new acts in the genre.

Aurora Ortus is a black/doom metal duo from São Paulo, Brazil composed of Victor Alves (guitar, drums, bass, vocals) and Dhiego Joly Botogoske (vocals), whose name translates roughly as "dawn's ascension" — a metaphor for hope emerging from depression. Since forming in 2019, they have built a prolific discography including "Drought," "Sunless Life," "Ostara," and "Against Ourselves," exploring themes of depression, mortality, and nature through slow, suffocating riffs and bleak atmospheres.

Austral is a black metal band from Santiago, Chile, formed in 2018, whose lineup features vocalist Matías Briones (aka Zaitham Iscariote), guitarists Blackterium and Maleficarvm, bassist Terrorwielder, and drummer Invokker. The band released their debut full-length, the sprawlingly titled Pestilential Souls Falling into the Endless Vortex of Misery, in 2018, drawing on themes of mysticism and spiritual corruption.