Ascoroso is a goregrind and death metal band from Sousa, Paraíba — a notable outpost for extreme metal in Brazil's Northeast region. Formed in 2020 and fronted by vocalist Capiroto, the band has been prolific in the split format, releasing material alongside acts like Vítimas do Crack and Murgo, with Portuguese-language track titles dealing in visceral gore imagery. They appeared on the 2020 international compilation "The Great Blood Feast Vol. 1."

Asense is a progressive death metal and metalcore band from Santiago, Chile, formed in 2009, whose discography spans three albums: "The Cold Nightmares of Belphegor: Tempest in Seven Regions" (2009), "Cellarius" (2014), and "tō kyō - o da i ba" (2018). Their lyrics address sociopolitical themes and complex philosophical ideas, and all three records are available independently on Bandcamp.

AshBürn is a power metal band from Vitória, Espírito Santo, formed around 2014–2015 and led by vocalist Heron Ribeiro. The band released the album "You Can Not Kill What Can Never Die" in 2020, recorded and produced by Thiago Bianchi at Fusão VM&T Studios in São Paulo, and has shared stages with established Brazilian metal acts including Almah (featuring ex-Angra vocalist Edu Falaschi) and Noturnall.

Ashes of Mirra is a progressive metal band from Rio de Janeiro, formed in 2023, featuring vocalist Weslen Amorim, guitarists Fabio and Sebastian Garcia, and bassist Roberto Ribeiro. The band released their early material on Bandcamp, with tracks including "The Pangea Puzzle," "Limit," and "Speechless," pointing toward a sound that favors compositional depth within the progressive metal tradition.

Ashtoreth is a doom/black metal band from Florianópolis, Santa Catarina, whose music is steeped in the mythology and folklore of the city known as the "island of magic." Their 2022 debut album Bruxólico — released on Dejeto Sonoro Records — weaves distorted guitars, unconventional percussion including a zither, and varied vocal approaches into six tracks across 40 minutes, drawing on local witchcraft legends and the poetry of Symbolist writer João da Cruz e Sousa. The album is envisioned as the first part of a trilogy.

Asilo was a Buenos Aires sludge, drone, and doom metal collective that built a catalog of slow, crushing releases across the 2010s, including the split with Neh Czneg (2013), Comunión (2014), and Desintegración (2019). Their approach leaned toward extended, corrosive compositions that placed them firmly within the heavier end of Argentina's underground doom scene.

Asper is a heavy metal band from Porto Alegre, Rio Grande do Sul, active since 2018 in one of Brazil's most established regional metal scenes. Porto Alegre has long been a hub for traditional and extreme metal in southern Brazil, and Asper operates within that tradition as an independent act.

Asphalt Grieving is a black/death metal act from Santiago, Chile, who debuted in January 2024 with the EP "Lack of Certainty," released by Black Legion Records as a limited clear CD edition of 300 copies worldwide. Later in 2024 they released a second EP, "Transgression of the Quantum Self: Tertiary Magnitude," featuring session drums by Krzysztof Klingbein and three tracks totaling approximately 24 minutes.

Aspidis is a dissonant black/death metal band from Jaraguá do Sul, Santa Catarina, founded in 2012. Their 2017 EP Reborn From Darkness and their more recent album Intruding Voices (2025) reflect a dense, abrasive approach to the genre with roots in the dissonant death metal current popularized by acts like Ulcerate and Gorguts.