Martyrium wove Gothic and Doom Metal together with lyrics drawing on literature, fantasy, and Thelemic philosophy, bringing a distinctly introspective and melancholic tone to the Minas Gerais underground. The band, whose Bandcamp release "Abandon Hope" captures their brooding sound, was short-lived, splitting up not long after forming in the early 2000s.

Mass of Souls combine black metal bleakness with gothic doom atmosphere, drawing clear influence from Candlemass — their self-titled demo even included a cover of the Swedish legends' "Solitude." The project surfaced in 2019 with the single Tales of a Rebel Soul, establishing a sound that sits at the darker, more sepulchral end of the doom spectrum.

Founded in January 2021 by vocalist and guitarist Melissa Ângela — known for her work with Dirty Grave and Mães Morrendo — alongside guitarist Pedro Barros and a rhythm section spanning multiple cities, Melissa plays slow, heavy doom metal drenched in dark psychedelic tones. Their debut "Devil's Mask" (May 2021) drew obvious nods to Black Sabbath, Pentagram, and Saint Vitus while carving out a moodier, occult-tinged atmosphere, with "Lost in Space" arriving in 2024 to expand the band's catalog.

Rooted in the South American underground, Mephistopheles play a morbid amalgam of doom, death, and black metal drawing from the same unholy lineage as Mystifier, Sarcófago, and Blasphemy. Their two early demo tapes — 'The Prophecy' and 'Black God' — were later compiled and released on CD by Voz da Morte Prod in 2018 as 'The Prophecy of Black God,' preserving eleven tracks of raw, English-language ritual extremity.

Mictian play a heavy death/doom blend rooted in the dark, mournful tradition of Black Sabbath and carried forward by three brothers who formed the group after their previous cover band dissolved. They documented their early sound on the demo CDs Hallucination (2005) and Lost in My Sick Mind (2010), and appeared on the Brazilian compilation Doomed Serenades Volume 2 in 2015.

Monje is a stoner/doom metal band from Buenos Aires, active since 2016, featuring guitarist Diego Petullo, vocalist Matias Ibañez, bassist Lucas Scardamaglia, and drummer Diego Hernandez. The band has released three studio albums — Monje (2018), Druga Dimenzija (2020), and Culto al Fin de los Tiempos (2023) — alongside a live album, Igual de Macabro: Live Bunker (2022). Their later work incorporates dissonant harmonies, blast beats, and black and death metal influences alongside the core doom sound.

Moonmath is a gothic/doom metal band from the interior of Rio Grande do Sul whose sound is heavy, melancholic, and psychologically dense, drawing on nihilism and introspection as core lyrical pillars. They have self-released two six-track albums — The Whisper's Hand (2017) and Isolated (released across 2018–2021) — both recorded locally and independently.

Morbydia drew from the European gothic doom tradition — think Paradise Lost and early Tristania — blending mournful female vocals with heavy, melody-driven riffs and keyboard atmospherics. The band released the album "Saturnia" and earlier recorded "Requiem To The Sun" through Avernus Records, building a small but devoted following in the Brazilian underground before splitting up.

Active since the early 2000s, Morcrof weaves black and doom metal through a lens of occultism, mysticism, and existential philosophy, with Latin and Hebraic titles underscoring the band's esoteric leanings. Their 2005 full-length "Machshevet Habriá (Myths and Conjectures of Creation)" stands as a cornerstone of their catalog, and they have remained prolific into the 2020s with releases including the 2022 full-length "De Pessimism Philosophiam et Dogma Nihilistic."