Irreversible Mechanism is a Minsk-based progressive/technical metal project featuring Vladislav Nekrash on guitar and bass, Andrew Parmon on guitar, and Dan Presland on drums. Originally rooted in progressive death metal before incorporating stoner rock elements, the band is known for highly technical, instrumental-leaning compositions produced, mixed, and mastered entirely by Nekrash.

Irreversum is a progressive thrash/death metal band from Kraków, Poland, active since 2012 and merging death metal's heaviness with thrash's relentless velocity. The project delivers aggressive crossover fury.

Isgherurd Morth is a avant-garde/progressive black metal project from Krasnoyarsk, Russia, active since 2021 and forging dark, aggressive extremity within the Russia black metal scene. The project channels the unrelenting intensity of the genre.

Iskalde Morket is a progressive black metal project from Norwich, United Kingdom, active since 2014 and forging dark, aggressive extremity within the United Kingdom black metal scene. The project channels the unrelenting intensity of the genre.

Isolirion is a progressive/technical groove/thrash metal band from Pantigliate (Milan), Italy, active since 2020 and blending thrash metal's velocity with groove metal's rhythmic punch. The project delivers high-energy, riff-driven metal.

Isometry is a progressive metal band from Turin, Italy, active since 2023 and crafting ambitious, technically proficient compositions that push beyond conventional metal boundaries. The project channels progressive sophistication.

Isospin is a progressive metal band from Larissa, Greece, active since 2013 and crafting ambitious, technically proficient compositions that push beyond conventional metal boundaries. The project channels progressive sophistication.

Istårn is a progressive/melodic black metal act from Bergen, Norway, active since 2013 and channeling melodic sensibilities through the atmospheric intensity of black metal. The project delivers sweeping, emotionally resonant extreme metal.

Isurus is a progressive metal band from London, United Kingdom, active since 2011 and crafting ambitious, technically proficient compositions that push beyond conventional metal boundaries. The project channels progressive sophistication.