Symphonic and melodic black metal band from Governador Valadares, Minas Gerais, formed in 2003 and previously signed to Avernus Records. Their music centers on anti-Christian and atheist themes, placing them within the philosophically provocative wing of Brazilian black metal; their orchestral arrangements and melodic sensibility set them apart from the rawer extreme metal acts that dominated Minas Gerais in the same era.

Athemesis is a symphonic metal band from Medellín, Antioquia, Colombia, active since 2009. The band released their debut full-length, "El Diario de Rozen Krov - Remembranzas," in 2021, following a series of EPs and singles dating back to their 2010 demo "Sinfonía para la noche." Their music explores themes of existentialism, romance, religion, and death, with a lineup that has grown to include dual vocals, keyboards, and lead guitar.

Atheris is a progressive and symphonic metal project from Buenos Aires led by Julian Muller, released through the Amniote Editions label and known for conceptually linked releases including ZRS-1: Instant Molting 1.0 and ZRS-2: Instant Molting 2.0 in 2019, followed by the Maculata EP in 2022. The project takes its name from a genus of venomous bush vipers, with track and album titles drawn from herpetology, underscoring a distinctive conceptual identity.

Athkan is a groove and thrash metal band from Salta, Argentina, formed in 2013 by guitarist Gustavo Díaz and bassist Sergio Ruiz. Drawing on the post-thrash heaviness of Pantera and Meshuggah, the band released two records in 2013 — the album Walking Through Fear and the compilation Simbiosis — with vocalist Mauro Espínola and drummer Eduardo Fernández rounding out the lineup.

Athos is a heavy metal band from Fortaleza, Ceará, formed in 2022 and currently active. Part of a thriving underground metal scene in Brazil's northeast, the band plays traditional heavy metal rooted in the classic sounds of the genre.

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.

Athus Cerimonae is a Brazilian black metal and dark ambient duo — Anatole (vocals, guitar, keyboards) and Angellus (bass, vocals) — whose music explores existential metaphysics and occult writing. Since their 2022 debut "Foedera Naturae," the project has released a series of albums weaving multilingual lyrics in Portuguese, English, and Romanian through atmospheric, ritualistic compositions.

Atiesia is a death metal trio from Ibagué, Tolima, Colombia, formed in 2017 by guitarist and vocalist Johan Esteban Moreno alongside bassist Diego Osorio and drummer Cristhian Guarnizo. The band released their debut EP "Falsos Altares" in 2019, a four-track recording rooted in fast, heavy death metal. They remain active and independent, with Moreno also active in several other Colombian extreme metal projects.

Atila is a heavy metal band from Posadas, Misiones, Argentina, considered one of the pioneering metal acts of the province. The band — built around vocalist Sergio Toledo, guitarist Javier Duarte, and bassist Cristian Guaglianone — released their debut album Azote de Dios in 2017, followed by a second record, Mal Negocio, blending classic heavy metal with updated material spanning two decades of the band's history.