Marco Melo is a progressive metal and shred guitarist from Pernambuco whose catalog blends intricate lead work with collaborative experimentation. His debut EP End of Days (2016) established his direction, and subsequent releases like Transcendent (with Hugo Rioli and Doug Brito) and Drained (with Filipe Soares) showcase a penchant for guest-driven compositions that push the boundaries of technical metal guitar.

Formed in Barbacena, Minas Gerais in 2005 by bassist Delmario Lauriano and guitarist/vocalist Rodrigo Costa, Marmorium Crucis blended gothic doom with deathrock and psychedelic textures, drawing lyrical themes from regional folklore — sanatoriums, cemeteries, and misty streets. Their 2011 demo Le chemin de croix des ames collects nine originals alongside a cover of the Rolling Stones' "Gimme Shelter", capturing the band's phantasmagoric aesthetic before their eventual dissolution.

Marnak is an atmospheric black metal project from Rio Grande do Sul that debuted in 2025 with the EP Xuèyǔ zhī Jì, a four-track release running nearly thirty minutes. The use of Chinese-language titles signals an interest in cross-cultural atmosphere, and the project slots comfortably into the expansive, melancholic end of the Brazilian atmospheric black metal underground.

Marthiria were a thrash metal band from São Luís, Maranhão, active from 2006 until their split in 2010, with a lineup anchored by vocalist/guitarist Andre Nadler and guitarist Rodrigo Lages. They released the EP Sobrevivendo ao Caos (2008), a direct, riff-driven effort in the tradition of Brazilian thrash that earned them a foothold in the local underground before the band disbanded.

Marthirio is a two-piece thrash/crossover band from Santa Fe, Argentina, formed in April 2018 by Matias Echauri (guitars, bass, and vocals) and drummer Lucas Engler. Their debut album Mosh Till Death, recorded at Superyeah Studios and mixed by Anibal Rodriguez at Blazing Hatred Records, was released on August 25, 2021, and includes a cover of Sepultura's "Troops of Doom."

Martirio is a metalcore band from Santiago, Chile, playing what they describe as evil metalcore with lyrical themes centered on anti-religion and social critique. They released their debut EP Siniestro Presagio I in 2023 through Death Farm Records, followed by Architecti mortis in 2024 and the full-length Los Siete Sellos in 2025 via The Coming Strife Records and Negativ2000.

Martirio was a thrash metal band from Federación, Entre Ríos, Argentina, whose documented lineup included vocalist Gustavo Ferreyra, guitarists Daron Sánchez and Adrián Padin, bassist Nicolás Iglesias, and drummer Juan Pablo Casco. The band released the demo "Decadencia" in 2009 before eventually splitting up. They are catalogued on Metal Archives under the Argentine thrash metal scene.

Marttyrium blend progressive thrash riffing with metalcore structures and death metal heaviness, setting themselves apart within the extreme metal underground of Amapá. The band released "Live Blessed" in 2006 and the album "Depois da Morte" in 2008, with Christian-themed lyrics exploring hope and faith, and appeared on the compilation "Diminishing Diabolical Strongholds" with the track "Bloodpath."

Marturion deliver brutal death metal with explicit Christian lyrical themes, an unusual pairing that places them alongside a small but dedicated scene of faith-driven extreme metal acts. Their self-titled debut EP features seven tracks including "Face A Face," "Drogas," and "Misericordia Eternal Soberana," released independently on CD-R.