An underground black metal project from Belford Roxo in Rio de Janeiro state, Pentagramaton center their work on occultist themes and a raw, uncompromising aesthetic. The band introduced themselves with a self-titled demo that established their stripped-down approach to the genre.

Per Umbram are a doom metal and stoner trio from Buenos Aires whose debut album 'Obscuri,' released on April 25, 2023, arrived as one of the more fully realized first statements in Argentina's increasingly vital heavy underground. The band's Latin name translates roughly to 'through shadow' and comes from the Virgilian phrase describing those who travel dark and alone through the night — a phrase that perfectly encapsulates the album's psychedelic, hallucinatory atmosphere. The six-track record runs through thematic territory ranging from media manipulation and systemic control ('Industrial Sanity') to mythological war imagery ('Long Fangs'), psychological isolation ('Fairy Tale'), and politically charged conflict ('No Mercy'), all filtered through a genuinely heavy lens of angular sludge riffs, powerful vocals, and extended song structures that reward patient listening. One reviewer described the album as 'angular stoner goodness from Argentina' that 'may take a few listens to fully appreciate but then will fast become a favourite' — an accurate summary of music that reveals itself gradually through accumulated weight rather than immediate impact. Per Umbram describe themselves as a trio who view music as something that works through them rather than something they consciously create — 'musical artifacts' through which their vision manifests — a philosophically serious approach that sets them apart from bands treating doom and stoner metal as purely aesthetic exercises. Buenos Aires has fostered a thriving doom, sludge, and stoner scene documented in outlets like Bandcamp Daily and through local compilations like those released by the Sabbra Cadabra label, which has helped map the broader Latin American heavy underground. Per Umbram fit naturally within this community while bringing their own distinct identity shaped by Buenos Aires's urban intensity and the vast emotional landscapes that define the best heavy music from the Southern Cone.

Perc3ption blend the melodic power of Angra-era progressivism with the compositional density of Dream Theater and Symphony X, drawing influences they've worn openly since their debut full-length Reason and Faith (2013), produced by Edu Falaschi of Almah and ex-Angra. Their third album Art in Extreme Situations (2023), mixed in the US by Adair Daufembach, is their most ambitious work, weaving together historical narratives around figures like Viktor Frankl and Van Gogh across nine tracks that stretch from tight four-minute cuts to an expansive thirteen-minute closer.

A one-person death metal project where David Lago handles all instruments and vocals, Perdição Dialética announced itself in December 2024 with a three-track demo featuring "Ressonância Subversiva," "Vértice da Perdição," and "Ruína da Lógica." The demo serves as a preview of a full-length already composed and in the mixing stage.

Peristaltic Movement traffic in old-school death metal built around grotesque medical and pathological imagery, best showcased on their self-released debut Anomalies Museum (2017), recorded at Estúdio AM in Rio de Janeiro and mastered in Athens. Tracks like "Cranioscopy," "Colonizing the Orbital Cavity," and "Desintegration of Human Tissue" make the thematic territory plain — this is clinical, unadorned death metal with no concessions to polish.

Founded in Divinópolis in 2008, Perlokus is a raw black/death metal duo — VoidNecroLust and HEL Antichrist Revenge — who cite Sarcófago's INRI as the defining template for their sound: primitive, blasphemic, and chaotic. After years of demos and a brief name change to Ritos Abominaveis, they returned as Perlokus and released two full-lengths, Ainda Morto e Decomposto (2016) and Hóstia Podre (2019) via Brazilian Ritual Records, both cementing their place in the South American underground extreme metal tradition.

Permafrost was a black metal band from Buenos Aires active during the mid-2000s and again around 2007–2010. They appeared on the Southern Elite Circle Compilation (2007) alongside fellow Argentine acts, and released a split titled A Blindfold Stained With Blood / Haunting the Forgotten (2009) with Campo de Mayo before ultimately disbanding.

Perpetual Faith play technically sharp old-school thrash metal rooted in the German school — think early Kreator and Destruction filtered through a Bay Area sensibility — and weave explicitly Christian themes throughout their lyrics. The band started releasing material in 2008 with the demo "Visions from Tomorrow" before issuing their seven-track EP "Price of My Head" in December 2014.

Perpetual Force deal in straightforward heavy metal and hard rock with a classic-era sensibility, delivering riff-driven songs that lean on groove and melody over extremity. Their 2016 debut "Absolute Power" introduced their eight-track blueprint, with tracks exploring themes of religion, justice, and human fallibility.