Apofenia is an old-school death/thrash metal band from the city of San Luis, Argentina, formed in late 2015 and playing their first show in January 2016. The band released their debut demo "Peste" in July 2016, a five-track assault featuring tracks like "Descuartizado" and "Muerte" rooted in brutal, no-frills extreme metal. Driven largely by siblings Anabelle Escudero on drums and Gisselle Escudero on guitar and vocals, Apofenia became one of the more notable all-female extreme metal acts in Argentina's interior provinces.

Apokalyptic Raids is a black/death/thrash metal band from Rio de Janeiro, originally formed in 1998 as Apocalyptic Raids — a name drawn directly from a Hellhammer EP — before adopting the current spelling in 2001. Driven by guitarist and vocalist Leon "Necromaniac" Manssur, they have released a string of albums and splits since their debut "Only Death Is Real" (2001), channeling the proto-black metal ferocity of Hellhammer, Bathory, and Vulcano while collaborating with acts like Whipstriker and Atomic Roar.

Ars Tenebrae is a death/black metal band from Pouso Alegre, Minas Gerais, formed in 2019, playing anti-Christian extreme metal rooted in Satanic and misanthropic themes. The band operates as an independent underground act, combining the ferocity of Brazilian death metal with the cold savagery of black metal in the tradition of Minas Gerais extreme music.

Ascendente is a death and groove metal band from São Paulo, formed in 2014 and active in the city's dense underground metal circuit. Blending the rhythmic punch of groove metal with the heavier extremity of death metal, the band belongs to a tradition of São Paulo acts that draw on both American groove and the brutality of classic Brazilian extreme metal.

Asterion is a progressive death metal band from Santiago, Chile, formed in 2006, featuring vocalist Matias Ibañez, keyboardist Eliseo Peña, guitarists Mauricio Silva and Alejandro Oliva, bassist Gustavo Miranda, and drummer Jorge Ovalle. The band released their debut album Nihil Perpetuum in 2008 and followed it with Zerzura in 2010 on Australis Records, blending elements of avant-garde, black, death, and doom metal.

Athron was a Brazilian death/thrash metal band active in the 2010s before splitting up. Playing in the aggressive tradition of Brazil's extreme metal underground, the band combined the riff-driven attack of thrash with the heavier, darker tonality of death metal.

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.

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.