Barrabás is a black metal band from Assis, São Paulo, whose music is built around the cosmic horror mythology of H.P. Lovecraft. Their 2013 full-length The Arrival of Yog-Sothoth, released on Nyarlathotep Records with members Kadax Azuhos, Paulo Portes, and Oksarrak, works through the entire Lovecraftian pantheon — Cthulhu, Shub-Niggurath, Nyarlathotep, Azathoth — in nine tracks of raw, ritualistic black metal.

Basmasura is a black metal band from Manaus, in the Brazilian Amazon state of Amazonas. One of the few metal acts from the isolated northern city, the band operates in the raw, underground tradition of Brazilian black metal with minimal web presence outside their Metal Archives listing.

Bastardos are a heavy/thrash metal band from Campana, Buenos Aires province, featuring guitarist and vocalist Leandro Maidana, guitarist Marcos Campos, bassist Facundo Bougnet, and drummer Cristian Basilio. The band released their album Visiones de un Mundo en Decadencia in July 2020, an eight-track record that includes tracks such as "Sacerdotes de la Miseria" and "Nada Quedará." Not to be confused with the Buenos Aires-based Bastardös, this band carves out a rawer, more street-level approach to Argentine heavy metal.

Bastardös are a thrash metal band from the La Paternal neighborhood of Buenos Aires, built around vocalist and guitarist Tommy Doglioli alongside drummer Federico Pinzolas, guitarist Camilo Ibañez, and bassist Maximiliano López. The band earned a reputation in the Argentine underground for visceral live shows and lyrics grounded in everyday street-level hardship. Their 2024 album Entierrö, a 27-minute slab of aggressive thrash, was formally presented at Uniclub in Buenos Aires to mark the record's official release.

Bastiel is a black/death metal trio from Ceará, founded by Thanatuz and Siffus as a garage project rooted in first-wave black metal before evolving into rawer, more extreme territory. Their EP Descendant of Moloch draws from Beherit, Archgoat, Blasphemy, and Brazilian touchstones Sarcófago and Mystifier, channeling occultism and existential esotericism through deliberately primitive, anti-melodic aggression.

Basttardz are a crossover thrash/hardcore band from São Luís, Maranhão, formed in 2020 during the Covid-19 pandemic. Taking cues from Ratos de Porão, Municipal Waste, and D.R.I., the band sings entirely in Portuguese and channels working-class Brazilian rage on their debut album Brasil com Z, which tackles labor exploitation and social inequality in eight tracks recorded in a garage spirit.

Batakazzo is a goregrind band from Copiapó, in Chile's Atacama region, delivering uncompromising blastbeat-driven extremity rooted in grotesque and pathological themes. After a live album recorded at the Casa de la Cultura in Copiapó (Vivo Penetración) and a self-titled release, the band put out their debut full-length Oculolinctus in 2018 through Putrid Tomb Records, followed by El Camino a la Descomposición Humana in 2019, the latter featuring the drummer from Decrepit Cadaver. Both albums were released on the Chilean underground label Putrid Tomb and distributed internationally through Sevared Records.

Battalion is a traditional heavy metal band from Itajaí, Santa Catarina, with roots going back to 2005. The trio — built around vocalist/guitarist Marcelo and drummer Fabiano — has released two studio albums, Empire of Dead (2013) and Bleeding Till Death (2020), working in the straightforward riff-driven style of classic heavy metal.

Battery was a thrash metal band from Jundiaí, São Paulo, active from 1998 until their split. Part of the interior São Paulo underground thrash scene, the band played in the aggressive Bay Area–influenced style that was widespread in Brazilian metal clubs during that era, with Jundiaí serving as a small but active node in the broader state metal circuit.