Mawiza is a Mapuche metal band from Wallmapu, Chile, formed in 2021 as the successor to Nunca Seremos Dichosos—a project that won the Pulsar Award (Chilean Grammy) for Best Metal Artist in 2020 for the album Kollong (2019). Performing in Mapuzungun, their ancestral language, and integrating traditional Mapuche instruments and rhythms into groove metal and metalcore, Mawiza have drawn international attention from acts including Slipknot and Gojira, the latter's Joe Duplantier appearing on their debut album ÜL (2025) on Season of Mist. Their work is as much a statement of Indigenous cultural preservation as it is a metal record.

Mercy Shot blend heavy and groove metal with hard rock influences into a muscular, hook-driven sound. Their 2022 album 'Brace for Impact!' showcases the band's range across ten tracks — from the churning 'Sink and Thrive' to the anthemic 'Massive Heart' — cementing their place in São Paulo's modern heavy rock scene.

Formed in Santos with a founding lineup of Marcus Vinicius on vocals, Fausto Pietro on drums, and Vinicius Guedes on guitar, Metallstein draw on old-school death metal, speed/thrash, and grindcore for a raw and uncompromising sound. The band released their self-titled debut single containing six tracks in early 2023 and have since appeared on the 'Workingclass In Roll – Brazilian Compilation' with the track 'Sonho Súbito'.

Metralleta is a heavy/groove metal band from Larroque, Entre Ríos, a small city in eastern Argentina seldom represented in the local metal scene. Their recorded output includes the 2009 album Todo o Nada and the follow-up Puente, released on August 1, 2014, which features tracks such as "Cuando los muertos viven," "Vértigo," and "Victoria."

Metralleta is a heavy/groove metal band from Larroque, Entre Ríos, a small city in eastern Argentina seldom represented in the local metal scene. Their recorded output includes the 2009 album Todo o Nada and the follow-up Puente, released on August 1, 2014, which features tracks such as "Cuando los muertos viven," "Vértigo," and "Victoria."

Mortom plays a hard-hitting blend of thrash and groove metal from the city that gave the world Sepultura and Sarcófago, drawing naturally from that rich legacy of heaviness. The band released their self-titled debut EP in December 2020, a five-track statement packed with driving riffs and the kind of thick, mid-paced groove that defines the Minas Gerais metal tradition.

Mothercow plays a swaggering mix of southern rock grit and groove metal heaviness, channeling the spirit of Pantera and Down into a distinctly interior São Paulo setting. After a long hiatus, the band returned with their full-length debut "Death Before Defeat" in 2022, followed by the six-track EP "Baptized in Gasoline" in 2024.

Nastik is a death/thrash metal band from Quilicura, Chile, playing a groove-heavy style they label brutal groove death metal. The band released two albums simultaneously in July 2018 — Human Sacrifice, built around fictional narratives of lost civilizations and ritual sacrifice, and GNOSTIC, exploring ancient mythology and esoteric philosophy through tracks referencing Egyptian and indigenous traditions. Both records are self-released digital albums available on the band's Bandcamp page.

Necrofactor is a death/thrash metal band from Chile playing a groove-driven style they describe as groove thrash. The band released the full-length Ciclo de Destrucción in November 2016, an eleven-track independent album with Spanish-language lyrics exploring themes of destruction, illness, and political defiance. The record is distributed digitally on major platforms and was stocked physically through Chilean metal label Australis Records.