Imperium Sacrum is a project from Bielefeld, Germany, active since 2003, evolving from ambient origins into atmospheric black metal territory. Over two decades, the band has shifted from pure soundscape composition to incorporating the tremolo-driven aggression of black metal.

Imperivm is a thrash metal band from Fuenlabrada, Spain, active since 2017, delivering aggressive thrash from the southern Madrid metropolitan area. The band channels the speed and riff-driven attack of classic thrash through a modern Spanish lens.

Impermanence is a death metal band from Munich, Germany, formed in 2019, exploring themes of transience and mortality through crushing extreme metal. The band channels the philosophical weight of its name into compositions that balance technical precision with visceral brutality.

Impermanent are a London extreme metal band whose early material presents a brutally direct blend of slam, death metal, and hardcore. The project surfaced with Forging Eternity, a short but punishing release that favors dense riffs, guttural vocals, breakdown pressure, and a production style built to make each hit land with physical weight. Tracks such as "Mass Psychogenic Illness," "Spiralisation," "Defilement of Self," and "Corporal Immortality" move between churning death metal and hardcore-derived impact, keeping the arrangements compact while still leaving room for abrupt rhythmic shifts. The band's sound is not ornate or atmospheric in the traditional sense; it is focused on compression, force, and the ugly momentum of heavy music stripped down to its most violent impulses. Impermanent's identity is still in its earliest public phase, but the first release already establishes a clear direction: low-tuned death metal with slam brutality, hardcore pacing, and a cold, clinical sense of heaviness. The result is music built for listeners who want death metal's extremity and hardcore's immediacy in the same body.

Black metal band from Kuopio in eastern Finland, active since 2016. Their sound channels raw black metal from the Savo lakeland.

Impherya is a death metal band from Florence, Italy, active since 2016 and delivering uncompromising extremity through crushing riffs and guttural vocals. The project channels the relentless brutality of the genre.

Impiety is a black metal band from Sommerda, Germany, active since 2013, forging uncompromising black metal from the Thuringian countryside. Not to be confused with the Singaporean war metal act of the same name, this German incarnation pursues its own path through atmospheric darkness.

Impious Vesper is a black metal project from Modena, Italy, active since 2020 and forging dark, aggressive extremity within the Italy black metal scene. The project channels the unrelenting intensity of the genre.

Progressive metal band from Oulu in northern Finland, formed in 2024. Their sound explores progressive metal territory from the Arctic gateway city.