[[caption-width-right:234:Mortiis, in his natural habitat.]]

Mortiis is a band from Notodden, Norway fronted by Håvard Ellefsen (former member of the BlackMetal band {{Music/Emperor}}), who is also known as the namesake of the band. The name is a misspelling of the word 'mortis', [[ItIsPronouncedTroPay which is the pronunciation used by the band]]. However, Mortiis started as the solo project of Ellefsen as a means to convey a story. This aspect was lost over time and Mortiis slowly formed into a band. Between 1993 and 1999 the solo project focused on dark {{ambient}} music, until 2001's electronic influenced ''The Smell of Rain'', which featured more lyrics and style-wise ranged from {{Industrial}} to SynthPop. With the release of ''The Grudge'' Mortiis became an official band rather than a solo project, and the music shifted toward IndustrialMetal.

Until 2007, Mortiis was never seen without his mask; a troll-like face with a large nose and pointed ears. The mask changed over time as well; by the release of ''The Grudge'' it began to look like it had been stitched and stapled in place. Finally after 2007's ''Some Kind of Heroin'', Mortiis removed the mask permanently; or so it seemed, as Ellefsen has been reappearing in the mask since 2016, perhaps due to fans requesting it.

Era I
* ''The Song of a Long Forgotten Ghost'' (1993)
* ''Født til å Herske'' (1993)
* ''Ånden som Gjorde Opprør'' (1994)
* ''Keiser Av En Dimensjon Ukjent'' (1995)
* ''Blood and Thunder'' (1995)
* ''Crypt of the Wizard'' (1996)
* ''The Stargate'' (1999)
Era II
* ''The Smell of Rain'' (2001)
* ''The Grudge'' (2004)
* ''Some Kind of Heroin'' (2007)
* ''Perfectly Defect'' (2010)
Era 0
* ''The Great Deceiver'' (2016)


* AGodIAmNot: "Monolith", from ''The Smell of Rain'' seems to be about this.
* AllTrollsAreDifferent: According to Ellefsen, "I do not look upon myself as a goblin, or troll, or elf, or medieval. [[IAmWhatIAm I am merely Mortiis.]]"
* BreakupSong: "The Grudge" is a particularly angry one.
* BSODSong: "Everyone Leaves", a song about how everyone you know will eventually leave you or die no matter how hard you hold on.
* ConceptAlbum: Pretty much anything from Era I.
* CoolMask: Ellefsen's prosthetic rubber mask was loved by fans. Although the mask was dropped after ''The Grudge'' Ellefsen has worn it again since "Era 0" in 2016.
* EraSpecificPersonality: Ellefsen, and the music itself.
* GenreShift: Mortiis is a fairly drastic example of this, having gone through at least three different genres.
* GriefSong: "Everyone Leaves"
* KayfabeMusic: The troll gimmick, which has now been dropped for better or for worse.
* NewSoundAlbum: Practically every album since ''The Smell of Rain''. The changes in his style are divided into "Eras" by fans.
* PointyEars: Part of the mask Ellefsen wears.
* ReligionRantSong: "Underdog"
* WickedWitch: Subject of the song "Smell the Witch"