Self-described as "deadly corrosive crossover," this Brasília five-piece — led by vocalist Lauro "Zapata" and guitarist Gabriel "Zenön" — released their debut full-length Corrosive Hatred in November 2021, a ten-track assault recorded at Texas Studio. The record blends thrash riffing with hardcore-punk velocity and a powerviolence-adjacent ferocity, with tracks like "Destroy the State" and "Underground is Not a Competition" making the band's antagonistic stance explicit.

One of the pioneering female-fronted grindcore acts in Brazil, No Sense from Santos made an early mark with the "Out of Reality" EP and the full-length "Cerebral Cacophony" (1992, Cogumelo Records), led by vocalist Marly with blistering bursts that drew comparisons to Napalm Death's early violence. After disbanding in the 1990s, the band reunited and released the comeback album "Obey" (2011), bringing the original lineup back to a style rooted in madness, social alienation, and pure grindcore aggression.

Nocthun describes their music as "apocalyptic antifascist metal," channeling blackened death metal into explicitly political and confrontational themes. Their debut full-length "Rest in Flames" establishes the project with tracks like "In the Uncanny Valley of Death" and "Volcanic Hellfire," pairing blast-driven aggression with ideological conviction.

Nocturnal Bleed play old-school death metal with a raw, unpolished ferocity rooted in the Floridan and Swedish traditions, releasing the debut full-length Lake of Fire in 2024 — a ten-track assault spanning short blasts like "Morbid Whisper" through to lumbering cuts like "Planetary Slavery" and "Devour the Corpse." The record was preceded by the 2023 single "Scourge of Pain," establishing the band's place in the Pará underground.

Nofek are a death metal trio from Bertioga whose recorded activity dates to the mid-2000s, issuing the demos Os Sete Flagelos in 2004 and Golgota in 2006. The consistent lineup of Douglas Liberato on vocals and guitar, Márcio on bass, and Carlão on drums has persisted across the band's long underground existence.

NoxEternum is a black/death metal band from Alto Paraná, Paraguay, active from 2022 until their split-up. In their brief existence they were prolific, releasing two full-length albums — "Portal to NoxEternum" and "The Black Window of the Mind" — along with two singles, all in 2022.

Nuclear War is a thrash metal band from San Salvador, El Salvador, formed in 2015. Their sole release is the EP War Dance (2018), a short blast of war- and death-themed thrash recorded while the band was active. The band has been on hold since 2018.

One of the more savage relics of the late-1980s underground, Nuctemeron played a brutal and primitive blackened noise-grind that positioned them alongside other uncompromising Brazilian extreme acts of the era. Their 1990 demo Industrial Pollution and the captured chaos of the 1991 live tape Last Massacre represent the entirety of their output, later compiled on the FOAD Records release Posers Mutilation 1989–1991.

Nîn Morn is a doom/death metal band from Santa Cruz de la Sierra, Bolivia, formed in 2011 and signed to No Wasted Records. The band progressed from early EPs — Funeral (2012) and The Black Box (2015) — to their debut full-length Victus Paradisum in 2021, building a sound anchored in themes of death, despair, misanthropy, and nature. Their 2019 EP Valle de la muerte and 2023 single Lament continue to refine their dense, grief-laden approach to the genre.