A two-person project built around Pedro Caldas handling all instrumentation and Joaquim Ghirotti on vocals, O Anjo Exterminador channeled industrial noise, grindcore, death metal, and experimental electronics into a single claustrophobic whole. Their sole full-length, Tetragrammaton (2005), runs 71 minutes and pairs occult lyrical conceits with artwork by sci-fi and horror illustrator Edgar Franco, closing with a cover of Swedish hardcore legends Anti-Cimex.

Rooted in the northeastern underground scene, O Cão deliver a direct and uncompromising brand of crossover that draws on the combined experience of guitarist and vocalist Hugo Medeiros, bassist and vocalist Eddie Cheever, and drummer Átila Mesquita. The trio has built up a catalog across three releases — Demonstrando, Devorados pelo Cão, and Original Espanta Crente Style — each leaning hard into the abrasive, no-frills energy that defined 1980s crossover thrash.

Assembled during the pandemic in late 2021, O Espírito Profano wrote entirely in Portuguese and drew their themes from death, misanthropy, and spiritual suffering. Their short-lived run produced a self-titled release and a live EP recorded at the UFCAT university festival in Catalão, blending black, death, and doom metal into a dense and despairing sound before splitting up.

Operating under the pseudonym Lord Caronte, this Rio de Janeiro one-man project explored pagan metal built around themes of fantasy and mythology. The band left behind a demo, Forgotten Tunes, and contributed the track "Nameless Fairy Maiden" to the Stimmen des Ideals compilation (2007) before eventually dissolving.

Oath of Persistence work in the space where death and thrash collide, building their catalog around Lovecraftian and dystopian themes that run through releases including the demo Deadly Tentacles of Summoning, the album The Myths, and the 2023 EP Arrival. The three-track Arrival tightens their attack into focused bursts, with tracks like "Fear of the Unknown" and "Queen of the Swarm" showcasing the band's appetite for cosmic dread wrapped in grinding riff work.

A solo endeavor by the artist known as Kaelreth, Oblique Silhouette operates in the overlap between raw black metal, depressive black metal, and ambient, producing everything in a bedroom setting. The project's debut, the three-track EP Through the Hate Forests (December 2022), established a tone of deep melancholy and isolation, followed by a second EP, Grimlands Under the Moon Spectre, that pushed further into atmospheric territory.

Hailing from Ponta Grossa, Obscurantis fuses industrial textures with raw black metal hostility, wrapping esoteric and cosmic themes in a harsh, mechanised sound. Their 2020 debut "Pesta Mundi" runs six tracks — including the sprawling "Ktullanux" and the bleak "Ex Dei" — drawing on occult and astronomical imagery to build a genuinely unsettling atmosphere.

Obscure Dreams trades in a deliberately lo-fi strain of black metal that bleeds into ambient territory, sitting somewhere between harsh raw recordings and introspective drone. The 2021 release "Burden" — a three-track set featuring the corrosive "Craving for Lamentations" — captures a project more interested in mood and texture than convention, while earlier material like "Murmúrios da Lua" leans further into atmospheric, near-wordless drift.

Formed in November 2019, Obscure Relic play a ferocious, old-school-rooted black metal indebted to early Scandinavian brutality — all razor riffs, blast-beat drumming, and vocalist Caronte's infernal high-pitched shrieks stacked against guttural roars. Their 2020 EP "First Black Communion" announced a band comfortable in the genre's most violent register, followed in 2021 by the fuller "Black Sorcery Devotion", twelve tracks of occult-drenched, relentless attack.