Nocturnal Winter operate in the most obscure tier of the northeast underground, playing raw corpse-painted black metal with no concession to modernization. The band released two full-lengths — Shaitan a Face da Revelação Iniciática in 2004 and Sadomarsonáculo in 2008 — and have maintained a near-invisible profile outside of dedicated Brazilian extreme metal circles ever since.

Nordeath deal in the unholy intersection of speed and black metal, drawing equal inspiration from Bathory, Kreator, and Cruel Force as from Brazilian forebears Sarcófago and Whipstriker. Their 2018 debut EP O Chamado do Abismo announced a band committed to old-school underground ugliness, and they have since been signed to Norway's Edged Circle Productions, with a full-length following.

The solo project of Kavera, Northern Forest merged raw black metal aggression with expansive dark ambient passages inspired by the Amazonian landscape and the themes of seasons, night, and misanthropy. Releases including the album Natureza and the cassette A Eternal Winter on Depressive Illusions Records captured a desolate, nature-saturated sound rooted deeply in the northernmost reaches of Brazil.

A solo death/black metal project launched in 2023 by veteran musician Fábio Nosferatus Lima, who has been active in the Brazilian underground since 1994. Drawing on horror-film obsessions, his releases — including Chainsaw Massacre, Deus-Verme, The Exorcist, and Conjured — explore a grimy intersection of death metal brutality and black metal atmosphere rooted in exploitation-cinema imagery.

Nostos took their name from the ancient Greek concept of the epic hero's return home, and channeled that inward journey through bleak, atmospheric black metal. The project released the EP Misfortune and the single Altar before going silent, leaving behind a small but focused body of work built around introspection and desolation.

Formed by Thomas and Edu in the mid-2000s, Nuclëar Fröst channel Swedish d-beat hardcore, Japanese crust, and 1980s thrash into a politically charged war-metal hybrid. Their 2009 album Nuclear Winter Gloom and the 2014 self-titled EP show a band equally indebted to Discharge and early Bathory, with antifascist and nuclear-apocalypse lyrics running throughout. They have also appeared on several international splits alongside acts from the global crust underground.

Nudimmud draw on Mesopotamian mythology and demonology for both their name and their thematic framework, weaving those ancient references into coldly atmospheric black metal. Their 2012 split with Natimorto on Hammer of Damnation, titled Anointed in Angel Blood, introduced tracks like Melammu Xul and Daughters of Lot — occult-inflected compositions that show a band more interested in ritualistic weight than in speed.

Nulla Ratio is a solo black metal project from Curicó, Maule, conceived, recorded, and mixed entirely by the single member Iatros. The project debuted with Fire Wombs in June 2021, followed by Phases in November 2022, the latter released on limited cassette through Cognitio Mors Vincit, with themes centered on death.

Nöldr is the solo black metal and dungeon synth project of Lord Deathlaff, whose 2021 debut Misanthropic Forest established the project's tone: raw tremolo-driven riffs shadowed by a melodic melancholy, closing into dark ambient territory. Subsequent releases including the Dynasty ov the Darkened Evocations EP and Profane Eternity deepen a cosmology drawn from Tolkien, Norse myth, and the bleak aesthetics of second-wave black metal.