Agares was a black metal band from Tegucigalpa, Francisco Morazán, Honduras, active from 2006 to 2007. The band released a demo in 2007 and later appeared on the split Our Majesty Abomination (2022) via Croquemort Productions, the only label release associated with the project. Their material centers on themes of chaos and misotheism.

Agaurez is a black metal band from Belo Horizonte, Brazil, originally formed in 1998 and reconstituted in 2013 after a lengthy hiatus. Their debut "Un-Virtue-Vitae" (2002) on Demise Records represented traditional keyboard-driven black metal, but their second album "The Five Sigils" — released on the prestigious Brazilian label Cogumelo Records — marked a heavier evolution incorporating death and thrash metal elements. Thematically rooted in rational anti-Christian ideology, Nietzsche, and occultism, the band is one of Belo Horizonte's more enduring extreme metal acts.

Agdron was a death metal band from São Paulo, Brazil, active from 2022 until their split-up. During their brief existence they released three recordings — "Embrace the Unmaking," "Manifest the Veiled," and "Acknowledge the Cult" — each title suggesting a conceptually cohesive occult or cosmic death metal approach. The band maintained a presence under the Instagram handle @cultofagdron, underscoring the ritualistic angle of their project.

Age Nor Defields is a crossover thrash quintet from Mongaguá, on the São Paulo state coast of Brazil, fusing thrash metal with hardcore punk energy and grindcore experimentation. Their album "Mongahell" is a 25-minute barrage of politically charged, anti-fascist material delivered in Portuguese, mixing protest and class consciousness with acid humor and absurdist provocation. Reviewers have noted their earnest, exuberant approach and the Zappa-esque tendency to wrap pointed social commentary in comedic delivery.

Age of Artemis is a progressive power metal band from Brasília, Brazil, widely regarded as one of the finest acts in the Brazilian power metal scene. Their debut album "Overcoming Limits" (2011) was produced by Edu Falaschi of Angra, and their third full-length "Monomyth" (2019) secured international distribution in Japan through King Records, cementing their reputation. The band performed at Rock in Rio's 30th anniversary edition in 2015 and have built a catalog distinguished by melodic sophistication and ambitious compositional scope.

Age of Fear is a heavy metal band from Paulo Afonso, in the interior of Bahia, Brazil, formed in 2014. One of the few metal acts from this small city in the São Francisco Valley, the band operates in the classic heavy metal tradition and has released material including a self-titled EP, a demo "Echoes of a Lost Age," and the album "Born in Darkness." Their existence reflects the spread of Brazil's metal underground well beyond the major urban centers of São Paulo and Rio de Janeiro.

Ages of Blood is an Argentine black metal project formed in 2020 that works with themes of medieval mysticism, anti-Christianity, and occultism. The band released the demo Pagan Medieval Aristocracy in May 2020, followed by the full-length Vestiges of a Fallen Empire in August 2021, and then Chronicles of Abyssic Flames in November 2023. The project was released through His Wounds and is currently on hold.

Aggresion is a death/thrash metal band from Campo Grande, Mato Grosso do Sul, formed in 2012 and operating as a power trio with Eduardo Sparrenberger on vocals and bass, Caverna on guitar, and Felipe TerrorDeath on drums. Their 2024 album Covil de Feras, recorded at Estudio 45 in Campo Grande, leans into Brazilian folklore and indigenous resistance as lyrical themes, pairing them with a raw, satanic extreme metal aesthetic. The band contributed to underground anti-fascist metal compilations in 2018 and 2019.

Aggression Tales are a thrash metal band from São Paulo founded in 2006 by guitarist Felipe Ruiz alongside vocalist/bassist Bruno Pompeo and drummer Julio Príncipe. Their 2007 debut Scribbles in Blood is a concept album narrating the life of a fictional serial killer, with each of its twelve tracks written in collaboration with ten different fiction authors who each penned a chapter of the story. They followed it with Random Acts of Physical Disgust (2011) on Six Inch Nails Records, cementing a sharp, aggressive thrash attack with a dark literary bent.