Catacomb was a technical death metal band from Buenos Aires, Argentina, whose lineup included guitarist and vocalist Maximiliano Rodriguez, guitarist Joel Poggi, bassist and vocalist Nicolas Becker, and drummer Martin Marques. The band released their debut EP, Unavoidable Internal Process, in July 2019, followed by two further releases in 2023: Where the Numbers End and Paradigm Shift. Their sound paired dense technical riffing with electronic touches and occasional clean vocals, setting them apart from more conventional tech-death acts in the South American underground.

Catacumba is a black metal band from Serra, Espírito Santo, Brazil, formed in December 2003. Their sound blends the primal aggression of South American black metal with the frostbitten atmosphere of the Scandinavian scene, with lyrical themes spanning philosophy, nihilism, and hatred. Their debut full-length album Kratos was originally released in 2010 through Onslaught Records and reissued on CD in 2014 by Fallen-Angels Productions with a live bonus track.

Cataplasma is a thrash/death metal band from Los Ángeles in Chile's Biobío region, originally formed in the early 2000s under the name Carga before settling on their current name. Drawing influence from Chilean legend Dorso as well as international acts like Slayer and Sepultura, the band recorded their debut demo Gore Demencia in 2007 and have remained active in the regional underground metal circuit.

Catharsis Nocturna is a black metal band from Córdoba, Argentina, founded in 2006 by Darker Mysteria on vocals and keyboards, Austhrum Dominius on guitars and programming, and Svart Sjel on bass. The band released their first demo, Genesis Dramatica de lo Difunto, in August 2006, followed by a second demo in 2009, both steeped in themes of darkness, occultism, and nocturnal mysticism. Darker Mysteria and Austhrum Dominius have remained central to the Argentine underground black metal scene, also contributing to collaborations with other regional acts.

Causa Mortal is a heavy metal band from Villa Ballester, in the San Martín district of Buenos Aires Province, Argentina, formed in 2013. The band has performed at Argentine metal festivals including events organized by the Unión de Radios Metaleras, where they have played original material such as "Alumbrado, Barrido y Demencia" and "Privado de la Libertad". They represent the active grassroots heavy metal scene that has long flourished in the greater Buenos Aires metropolitan area.

Cauterization is a blackened death metal trio from Presidente Prudente, São Paulo, Brazil, consisting of Maysa Rodrigues on vocals and guitar, Wesley Moia on bass, and Mauro Trojillo Jr. on drums. The band released their debut EP Males Infestus in 2011, recorded at Oasis Studio in their home city; the release was later reissued on cassette by the Polish label Till You Fukkin Bleed (2012) and on CD by Morbid Syndicate (2013). A subsequent release, Id Katharsis, appeared in 2017 through the Brazilian label Cianeto.

Caveira is a stoner metal band from São Paulo, Brazil, active since 2003. The band features a five-piece lineup and delivers a dark, heavy sound rooted in the stoner and doom traditions. They released the EP “Spine” in 2021, which was picked up by the Stoned Meadow of Doom YouTube channel and gained attention in the international underground stoner scene.

Caverna is a black metal band from Patos, Paraíba, Brazil, formed in 2019. The band operates in the raw, underground tradition of Brazilian black metal and is listed on the Encyclopaedia Metallum. Patos is a small city in the northeast of Brazil with a sparse metal scene, making Caverna one of its rare representatives of the genre.

Cavina is a heavy metal band from São Paulo, Brazil, formed in 2014 by brothers Eduardo Cavina (vocals, bass) and Matteus Cavina (guitar). Their self-titled debut EP was released on August 28, 2014, recorded at Estúdio Lamparina in São Paulo, and conceived as the first act of a larger conceptual work exploring themes of society and human civilization.