Monasterium was a death/doom/gothic metal band from Teresina active in the late 1990s, releasing the full-length "Innocent Rise" on Demise Records in 1999 and a demo titled "Inviolable" in 1998. Their sound blended the heavy melodic sensibility of gothic doom with death metal weight, placing them among the more ambitious extreme acts to emerge from the Piauí underground.

Moonlight Scream began in 2012 playing death/black metal with themes of love and sorrow before pivoting toward an atmospheric, largely instrumental post-black metal sound in their later years. After a hiatus, the project resurfaced and eventually evolved into new incarnations — Ócio and then Passional — reflecting a continuous drift away from aggression and toward texture and mood.

Morbid Butcher were a death/black metal band from Espírito Santo whose roots trace back to the late 1980s underground tape-trading circuit, releasing demos such as Randiness of God (1988) and The Dark Plague (1994) before returning with Morbid Butcher Return (1998) and Fly for Darkness (1999). Their live album Muggefug (2006) served as a document of the band's raw, primitive approach before they eventually dissolved.

Morbid Devourment are a death/thrash trio from Brasília who consciously root their sound in the primitive filth of early-80s metal, citing Venom, Hellhammer, and Bulldozer as touchstones. Their 2025 debut EP Deathstrike Rebellion packs nine songs into eighteen minutes of raw, occult-themed extremity, following earlier singles that established the band's violent aesthetic.

Mordrom is a continuation of Crux Cullum, a band that ran from 2007 to 2016 before being resurrected under this name in 2024. The project blends death metal with thrash and black metal undercurrents, channeling themes of occultism, misanthropy, and anti-religion, with the album "Walking to Bloody Death" representing their current direction.

Moretools emerged from the Brasília underground with a self-titled debut that fuses death metal, grindcore, thrash, and hardcore into a relentlessly aggressive whole. The band has shared stages with Krisiun, Onslaught, and Torture Squad, and appeared at major festivals including Porão do Rock.

Led by guitarist and vocalist Fabrício Moraes, a veteran of the Brasília metal scene through his work in Dark Avenger and several other local acts, Mortaes debuted in 2007 with the album "Obsessive Visions" on Die Hard Records. The band blends death and black metal with neoclassical guitar flourishes, and the debut featured guest contributions from members of Dr. Sin, Khallice, and Miasthenia.

One of the oldest extreme metal bands in Paraná, Morthal trace their origins to 1987 and are often cited as the pioneer of the death/thrash style in the state, performing shows as far as Brasília and Asunción in the mid-1990s and releasing a split LP with Tumulto in 1992 that drew national attention in the underground press. After roughly 18 years of inactivity, the band reformed with vocalist Nilton Bobato and guitarist Zepa Costa among its ranks, picking up where their gritty, war-themed death/thrash left off.

Mortuário A.D. channels the raw, bestial energy of early Brazilian extreme metal through a death/thrash lens, citing Sepultura, Sarcófago, Mutilator, Vulcano, Obituary, and Hellhammer as touchstones. Their second release, "Die in Pain," dropped on Halloween 2024 and captures the horror-soaked ferocity the band has built its identity around.