C.R.U.E (Comando Resistência Underground Extremo) is a black/death metal band from São Paulo, Brazil, active within the city's underground extreme metal scene. The band is signed to Brazilian Ritual Records, under whose banner they released a split with fellow São Paulo act Transgressor featuring their material "Metal das Ruas" in 2021. Their music is rooted in the raw, aggressive tradition of Brazilian underground metal.

Caixão is a black/death metal band from Salvador, Bahia, Brazil, operating in the vein of Sarcófago, Hellhammer, Bathory, and Sodom with lyrical themes of death, anti-Christianity, and anti-cosmic Satanism. The band released the demo "Black Coffin Entities" and has issued further material including splits and a full-length album, "Herakles / Melqart," released on vinyl through Nuclear War Now! Productions in January 2025. They are currently signed to Diabolous Productions.

Carnage is a black/thrash metal band from Betim, Minas Gerais, Brazil, listed on Encyclopaedia Metallum as an active act under Headbanger's Behavior. The band's lyrical themes center on anti-religion, death, darkness, and hell, placing them firmly within Brazil's extreme underground metal tradition.

Clamatorius is a black/death metal band from Goiânia, Goiás, Brazil, originally active from 1999 to 2005 under their own name after an earlier incarnation as Postumus (1998–1999). The band is notable for fusing extreme metal with Christian lyrical themes and released the five-track album "Consummatum Est" through Blackened Label Records.

Clan dos Mortos Cicatriz is a death-punk band from Curitiba, Paraná, Brazil, blending raw black metal, death metal, and hardcore punk into what the underground has called "nekro-hardcore." The band released their debut album "Técnicas de Morte" in March 2025 via Sentient Ruin Laboratories, a 15-track, 25-minute record described as a grim manifesto drawing imagery from slums, prisons, morgues, and war zones.

Coliseum is a black/death/thrash metal band from Salvador, Bahia, Brazil. The band operates as an independent act within Salvador's extreme metal underground, combining elements of black metal, death metal, and thrash into their sound.

Corrossive is a death metal band from Buenos Aires, Argentina, formed in 2015. They released the demo Overcome the Darkness in 2016 before issuing their debut full-length The Great Beyond in 2021, an eleven-track record that draws on death, doom, progressive, and thrash metal influences.

Crematory was a black/death metal band from São Paulo, Brazil, active in the early 1990s. The independent band explored Satanic themes and released rehearsal material before splitting up.

Crucifixion BR is a black/death metal band that originated in Rio Grande, Rio Grande do Sul, Brazil, before relocating to São Paulo. The band released their debut album "Destroying the Fucking Disciples of Christ" (2014) through Horror Pain Gore Death Productions, blending diabolic black metal with 1980s thrash and death metal influences. Their second album "Human Decay" (2021), released on Shinigami Records, featured guest appearances from Dave Ingram of Benediction and André Rod of Brazilian thrashers Attomica.