Act of Revenge is a groove/death metal and deathcore band from Salvador, Bahia, formed in 2015 and anchored by vocalist Danfacto Oliveira, whose performance earned the band Best Vocalist honors at the Prêmio Palco do Rock 2014 popular vote — the same year they also won Best Band. Their 2018 EP 5 Atos delivers heavy, groove-driven material entirely in Portuguese, and the band has performed across multiple editions of the Festival Palco do Rock, establishing them as one of Salvador's most visible acts in the heavy underground.

Actum Est is a symphonic black metal band from Belo Horizonte, Minas Gerais, featuring a six-piece lineup that incorporates cello alongside traditional metal instrumentation — a rare texture in Brazil's black metal scene. Formed in 2005 (catalogued under their current activity since 2013), the band released the demo Obscure Symphonies Into the Black Mantle in 2006, channeling themes of occultism and darkness through a lush, orchestrated approach that sets them apart from the rawer strains of the Brazilian underground.

Ad Baculum is a black metal project from Salvador, Bahia, led by Lord Hades — formerly the vocalist of legendary Brazilian cult act Mystifier — who handles all instruments except drums. The band's debut Blackness Doctrine (2011) drew directly from the raw black/death vein Hades helped pioneer in Mystifier, while the third album Opening the Abyss (2016), released on Brazilian Ritual Records, shifted toward slower, doom-saturated tempos with howling, cavernous vocals and cover art taken from Gustave Doré's illustrations of Dante's Inferno.

Ad Extremum is a black metal band from Brasília, Brazil, formed in 2013 and signed to Nox Bellum Prod. Their music explores themes of Satanism, occultism, and suicide, rooted in the raw, atmospheric tradition of Brazilian black metal.

Ad Inferi is a symphonic metal band from São Paulo, Brazil, formed in 2020 from the ashes of the symphonic outfit Sacra. The group features vocalist Alessandra Lodoli alongside guitarist Lucas Moretto, and released their debut album "The Immaculate" with the single "The Red Lake" as an early showcase of their orchestral, dramatic sound.

Ad Inferno is a Brazilian black metal project that emerged in 2022, featuring members drawn from Campo Grande, Curitiba, and Rio de Janeiro. Their debut full-length "A Senda do Abismo (Spiritus Pestilens)", recorded and released in late 2022, presents a cold, underground black metal aesthetic.

Adaga — Portuguese for "dagger" — is a black metal band from São Paulo, Brazil, built around the duo of Anderson Ribeiro and Fabrizzio Hanoi. Their 2019 EP "Spawning Black Seeds" channels themes of darkness, occultism, and chaos through a stripped-down, underground black metal attack.

Addam's Nightmare is a progressive and melodic metal band from Buenos Aires, Argentina, founded in 2014 by guitarist Reaper O'Brian, later joined by Fear Monta on bass and Nico Granatera on drums. The band released their debut EP "Halloween For All" in November 2014, a four-track release that established their blend of progressive arrangements with melodic heaviness. What began as a conceptual side project quickly solidified into a fully active band within the Buenos Aires underground scene.

Addicted to Pain was a heavy metal and hard rock band from São Paulo, Brazil, led by vocalist and keyboardist João Paulo Pretti and featuring a lineup with ties to prominent Brazilian acts including Warrel Dane's touring band, Noturnall, Shadowside, and Seventh Seal. Their debut EP "Queen of All Lies" was produced at Norcal Studios in São Paulo, with keyboardist Juninho Carelli of Noturnall guesting on the lead single "The Kings Never Die".