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.

Ceasefire is a power metal band from Buenos Aires, Argentina, whose lineup features vocalist Horacio Alippi, guitarist César Delgado, bassist Andreas Alippi, keyboardist Daniel Tkach, and drummer Pablo Nardelli. The band has been active in Buenos Aires' metal scene since the early 2000s, releasing a demo in 2005 and continuing to develop their melodic, keyboard-driven power metal sound over the following years. Their blend of soaring vocals and dynamic arrangements places them firmly within the Latin American power metal tradition.

Cefem is a heavy metal band from Casilda, Santa Fe, Argentina, that released three recordings in quick succession: the album Historias Oscuras in April 2016, Pateando con el Rock n' Roll in September 2016, and Rictus Umbrio in November 2017. Their lyrical themes draw on myths, urban legends, and ancient literary sources, lending their straightforward heavy metal a distinctly eerie character. Tracks like "La Hija Malvada" and "El Farol del Diablo" from Rictus Umbrio showcase the band's appetite for dark storytelling within a classic Argentine metal framework.

Ceifador is a one-man thrash and speed metal project from Sorocaba, São Paulo, Brazil, created by Clayton Maximinus, a former guitarist of the thrash band Alcoholikiller. Active from 2003 through approximately 2020, the project released a string of independent albums including “Alcoholic Speed Metal” (2010), “Heavy Metal 666” (2014), and “All Hell Breaking Loose” (2020), all self-described as “Alcoholic Speed Metal from Hell.”