Hellish Form push doom to its most suffocating extreme, folding sludge's abrasive texture into funeral doom's glacial pace and near-unbearable weight. Formed in 2020, they embrace desolation as an art form — slow, suffocating, and strangely beautiful.

Oakland's High on Fire are one of the defining forces in American doom and sludge, built on Matt Pike's mythological vision and the kind of riff density that makes everything around it feel thin. Since reforming their presence in the early 2010s, they have remained one of the heaviest and most uncompromising bands on earth.

Fresno's Hymns to the Stone move at the pace of sediment, layering stoner fuzz, sludge grime, and doom weight into slow-burning rituals of sound. Since 2014, they've treated heaviness as a meditative practice rather than a competition.

Formed in Los Angeles in 2004, Intronaut forged a progressive metal sound that draws equally from sludge metal, jazz fusion, and post-metal, setting them apart within the Southern California heavy scene. Named best metal band by LA Weekly, the group built a catalog across multiple albums that gradually incorporated melodic vocal harmonies alongside their signature polyrhythmic instrumental interplay, with drummer Danny Walker and guitarist Sacha Dunable anchoring the lineup.

San Jose, California's Kevel have been in the heavy fuzz game since 2014, pairing stoner rock's psychedelic warmth with doom metal's glacial pace for a sound that's hazy, heavy, and fully hypnotic.

Los Angeles' King Need emerged in 2021 with a sound built on the slow grind of sludge and the hazed-out weight of stoner metal, fitting naturally into LA's tradition of downtuned heavy rock. Unhurried, thick, and deliberately oppressive.

Out of Costa Mesa since 2011, Mammoth Thunderpower fuse Southern California's sun-baked stoner aesthetic with the murky drag of sludge metal. The result is fuzz-drenched and relentless, built for long drives and longer nights.

Los Angeles' Mange operate at a grim crossroads of doom, sludge, and grindcore — a combination that sounds exactly as ugly and confrontational as it should. Since 2015 the band has weaponized tempo contrast, lurching between suffocating crawls and explosive blasts.

San Francisco's Martikor arrived in 2023 at the intersection of atmospheric sludge and post-black metal, a combination that suits the Bay Area's tradition of genre-bending heaviness. Dense, fog-laden, and built for patience.