Minneapolis's Sea of Vapors emerged in 2019 with a psychedelic sludge/doom formula that coats grinding low-end riffage in hallucinatory haze, reflecting both the claustrophobic winters of the upper Midwest and the region's tradition of heavy, exploratory music. Their approach adds lysergic disorientation to the standard sludge blueprint, letting songs drift and distort before collapsing under their own weight. Young but purposeful, they represent the Twin Cities' ongoing investment in the heavier end of psychedelic metal.

Nashville's Season of Arrows have been coaxing misery and momentum out of the intersection of doom, sludge, and stoner metal since 2014. Their sound is slow and punishing where it needs to be, but carries enough desert-rock swing to keep the weight from becoming purely oppressive. The band sits comfortably in the tradition of Southern heaviness — deliberate, loud, and uninterested in hurrying anything.

Formed in 2016 in Enid, Oklahoma, Self Inflicted drag the Southern metal tradition through the murk of sludge and doom, delivering slow-motion riffs drenched in feedback and regional grit. Their sound carries the weight of the Great Plains — unhurried, oppressive, and built low to the ground. Equal parts stoner haze and Southern hostility, they're a fitting product of Oklahoma's hard-edged underground.

Saint Paul, Minnesota's Semtex formed in 2021 and take an explosive approach to progressive thrash, combining the rhythmic intensity and angular riffing of thrash with the structural ambition and harmonic complexity that progressive metal demands. Named after the plastic explosive, their music favors precision over chaos — tight arrangements, shifting time signatures, and a forward-thinking approach that sets them apart from straightforward thrash revivalism. They reflect the technical ambitions that have been quietly flourishing in the Twin Cities metal scene.

Sen Senie Senči emerged in 2019 from Blairstown, New Jersey — a small town perhaps best known to horror fans as the setting for Friday the 13th — and channel that isolated, rural unease into heavy, grinding sludge metal. The Latvian-inflected name suggests a project thinking beyond conventional boundaries, and their sludge operates in the deliberate, punishment-oriented tradition that rewards patience over immediacy. They're a genuinely idiosyncratic act in a genre not short on them.

Tulsa's Senior Fellows have been delivering heavy sludge metal since 2013, drawing on Oklahoma's deep well of Southern-influenced heaviness to craft music that moves slowly and hits hard. The name carries a sardonic wit that the music doesn't always reflect — their sludge is serious, patient, and built on the kind of mountainous riff stacks that define the genre's most physically demanding work. They're a pillar of Tulsa's underground heavy scene and a reliable presence in the regional landscape.

Out of Layton, Utah since 2008, Septic Baptism have spent nearly two decades building suffocating walls of sludge and doom from the high desert. Their music moves at a glacial, punishing pace, drawing equally from the corrosive weight of sludge and the mournful slow-burn of traditional doom. They are one of Utah's most enduring heavy underground acts.

Minneapolis sludge metal outfit Serac have been at work since 2015, channeling the cold, bleak energy of the upper Midwest into slow, crushing riff structures. Their music bears the weight of extended instrumental passages and a commitment to atmosphere that sets them apart within the dense Minneapolis heavy music scene. Named after the unstable ice formations that precede glacier collapse, their sound evokes that same slow-building, inevitable devastation.

Seven Sisters of Sleep is a sludge and doom metal band from Southern California, formed in mid-2009 from members of Tafkata and The Arm and Sword of a Bastard God. The band built their sound on a foundation of occult-themed, downtuned sludge drawing from doom, death metal, black metal, and d-beat, releasing records on A389 Recordings and Southern Lord, among others. They released multiple full-length albums before disbanding following legal troubles involving a former member, leaving behind a body of work regarded as important within the Southern California heavy underground.