Inquisition are a death/doom metal band from Wöllersdorf-Steinabrückl, Lower Austria, playing slow, crushing metal with the grim patience that defines the doom/death tradition. The band remains an independent underground act, operating through Bandcamp without the backing of a label.

Insaniae is a doom/death metal act from Queluz, Portugal, active since 2010 and merging death metal's ferocity with doom's oppressive weight. The project inhabits the crushing intersection where both genres converge.

Insanity Reigns Supreme is a doom/death metal band from Opglabbeek, Belgium, active since 1993, self-described as a "cult of doom." Across a discography spanning Our Path Is Dark and Lonely through Unorthodox, the band has spent three decades forging crushing, ritualistic doom-death that ranks among Belgium's most enduring extreme metal legacies.

Insatiable is a doom/death metal act from Erica, Netherlands, active since 2018 and merging death metal's ferocity with doom's oppressive weight. The project inhabits the crushing intersection where both genres converge.

Melodic death/doom metal band from Bilbao in Basque Country, formed in 2021. Their sound merges melodic death metal with doom metal's crushing pace from the Basque capital.

Inside You is a doom/gothic metal act from Istra, Russia, active since 2023 and channeling monolithic heaviness through its doom metal framework. The project delivers oppressive, glacially paced compositions.

Insonika is a stoner/doom metal band from Jönköping, Sweden, active since 2018 and delivering crushing, fuzz-laden heaviness where doom's oppressive weight meets stoner metal's hazy grooves. The project channels low-end power and psychedelic atmosphere.

Intaglio is a funeral doom metal project from Oryol, Russia, active since 2005 and crafting glacially slow, suffocating heaviness at the most oppressive tempos in extreme metal. The project plumbs the depths of despair through crushing, extended compositions.

Interhell are a three-piece instrumental stoner and doom metal band from Vienna, founded in 2010 and playing a mix of groovy, melodic, and occasionally psychedelic riff-driven compositions. They released Industrial Dog in 2018 and a self-titled record in 2023, and have shared stages with visiting acts including Eyehategod.