OUDN — short for Our Ultimate Dying Nightmare — blend melodic modern death metal with groove-driven riffing and a polished production sensibility. Their catalog includes the EP Save Us from Ourselves (2016) and the full-length Time to Decay (2018), which display a sound that favors rhythmic punch and melodic hooks over pure extremity.

Named after the legendary ghost ship whose crew perished under mysterious circumstances, Ourang Medan channel that maritime dread into slow, crushing sludge and doom built around themes of cosmic horror and the occult. Their debut full-length Lords of Eternal Seas (2016), recorded at Estúdio Warsong in Natal, captures a dense, ritualistic heaviness that earned them recognition as one of the northeast's standout underground acts.

Originally a Kreator cover project called Hordes of Aggression, Outlanders reoriented toward original material after changing their name in 2011 and spent years honing a Bay Area-influenced thrash attack. Their debut album From Chaos to Extinction, produced by Thiago Bianchi at Fusão Studios and featuring guest vocals from Chuck Billy of Testament, finally arrived after years of recording and stands as a focused statement of old-school thrash conviction.

Forged in São Paulo in 2015 before relocating to Dresden, Germany, Outlaw play an orthodox, melodic brand of black metal with clear debts to Dissection, Watain, and Necrophobic. Their prolific output — spanning Path to Darkness (2018), The Fire in My Tomb (2020), Death Miasma (2021), Reaching Beyond Assiah (2023), and Opus Mortis (2025) on AOP Records — reflects a band that has steadily sharpened its craft across the Atlantic.

Overall Miscreation deal in technically-minded death metal underpinned by themes of misanthropy, anti-religion, and apocalyptic collapse. After their 2019 debut Tales from the Abyss, they returned in 2024 with Emissary of the Great Armageddon, a seven-track record that pushes further into technical territory while keeping the songwriting rooted in blunt aggression.

Formed in Teresina around 2017, Overdose Brain play a ferocious brand of speed/thrash metal sung in Portuguese, drawing on the Brazilian underground tradition of acts like Flagelador and Cemitério. Their 2020 EP Exército Metal, recorded with vocalist Thiago Araújo, guitarist Cláudio Costa, bassist Alisson Barros, and drummer Wanderson dos Anjos, showcases cutting riffs and an uncompromising approach rooted firmly in 1990s aggression.

Overdose Nuclear coined the term "Metal do Mangue" to describe their death/thrash sound rooted in the coastal town of Ubatuba, pairing heavy riffing with socially conscious lyrics about environmental destruction and political corruption. Their 2023 album Metal do Mangue features guest appearances from Mayara Puertas of Torture Squad and Jairo Vaz Neto of Chaos Synopsis, alongside a cover of Raul Seixas's "Cowboy Fora da Lei," cementing the band's distinct identity within the Brazilian extreme metal scene.

Overlook are a Curitiba-based thrash metal outfit built around guitarist Matheus Savi, vocalist and bassist Ricardo Brito, and drummer Gabriel Cordeiro, maintaining the stripped-down aggression typical of the Brazilian underground scene. Their EP Redrum established them as a straightforward thrash act with no frills, channeling the direct energy of classic 1980s riff-driven metal.

Overnoise were a thrash metal band from Sorocaba active from 1990 through the early 2000s, featuring the sibling rhythm section of guitarist Carlos Navarro, guitarist Leandro Gamero, bassist Alex Navarro, and drummer Fernando Gamero alongside vocalist Daniel V. Filho. They released a self-titled demo in 2001 before splitting up, leaving a small but documented mark on the São Paulo state underground thrash scene.