Archityrants is an epic doom metal band from Curitiba, Paraná, Brazil, emerging from the earlier project A Tribute to the Plague (1998–2007) before reforming under their current name. The band has released several recordings including the debut album Black Water Revelation (2011) and the EP Sleep of the Damned (2016), crafting lengthy, melancholic compositions built around themes of darkness and sorrow.

Archtype is a power metal band from São Paulo, Brazil, formed in 2013, carrying forward influences rooted in the classic Brazilian power metal tradition. Their lyrical themes revolve around esotericism and prophecy, setting them apart from the more fantasy-oriented peers in the genre. The band emerged partly from the lineage of earlier São Paulo acts and has remained active on the underground circuit.

Ardid is a thrash metal band from the Florencio Varela area of Buenos Aires province, with a lineup including Marcelo Lopez on vocals and bass, Jorge "Costra" García on guitar, and Ricardo "Ricky" Rodriguez on drums. The band completed their album "Mundo en coma" in 2023, presenting it live at Zadar Club in Wilde. Their material draws on classic thrash influences while addressing themes rooted in the working-class neighborhoods of the southern Buenos Aires conurbano.

Are You God? was a brutal death metal and grindcore band from São Paulo, Brazil, active from 2001 until their split-up. They released their 2001 debut demo as a handmade CD-R on recycled paper, distributing over a thousand copies for free — a gesture rooted in the DIY ethos of the São Paulo underground. Their discography includes the 2006 album Miranda (released via Travolta Discos and 2+2=5 Records) and a 2008 split with German grindcore act Japanische Kampfhörspiele.

Argos is a heavy metal band from São Paulo, Brazil, founded in 2009 with a lineup anchored by vocalist Fabio LaTorre and dual guitarists Reginaldo Barros and Andre de Sá. The band takes its name from the all-seeing giant of Greek mythology, reflecting their stated intent to draw from multiple metal styles without being confined to a single subgenre. They released the EP In the Name of Tragedy in 2009 and gained airplay on São Paulo's Central Rock Radio (107.1 FM).

Aridonia formed in San Salvador de Jujuy in Argentina's extreme northwest, with a lineup of Fernando Echenique on guitar and vocals, Benjamin Yecora on guitar, Tomas Longombardo on bass, and Matias Paiva on drums. The band released their debut EP, "EP1", in 2017, followed by their self-titled full-length in 2020, a seven-track record praised for bridging stoner metal, doom, and progressive rock influences. Comparisons to Tool, Kyuss, and Baroness have been noted by reviewers, reflecting the band's blend of heavy riffing and atmospheric song structures.

Ariel/Kaliban is a power and folk metal band from Palmeira dos Índios, Alagoas, Brazil, founded in 2007 and drawing heavily on Brazilian literature for their Portuguese-language lyrics. Their 2012 EP O Trágico marked a darker turn in their sound, blending power metal structures with flute and folk elements while remaining rooted in literary themes of mortality and the ephemeral. The five-piece lineup features flute alongside guitars and bass, giving their music an uncommon texture within the northeastern Brazilian metal underground.

Arithmetic Overflow is an instrumental progressive post-metal band from João Pessoa, Paraíba, Brazil, formed around 2019 and operating in a corner of the Brazilian metal scene rarely occupied by acts from the northeast. Their sound fuses djent-influenced rhythmic precision with expansive post-metal atmospherics, as heard on their 2020 album Expanding the Mind. The band records and releases independently, with their music available via Bandcamp.

Arjé is a power metal project from Perico, Jujuy, Argentina, led by multi-instrumentalist David Aguirre. The band's foundational album "Buscando Horizontes" became a touchstone of the Latin American Christian heavy metal underground, later reissued in remastered form through Headlight Productions with bonus tracks.