Ondskapt were formed in Stockholm in 2000 by vocalist Acerbus and drummer Nabemih, their guitarist at the time Skamfer came up with the band's name.

Nattdal left Ondskapt in 2007 to focus on his bands IXXI and Lifelover but died due to an accidental prescription drug overdose on 9 September 2011.

In 2017 the band posted their new line up on their official Facebook and announced that they would finally start the writing and recording process of their fourth album, however in 2019 guitarist Draugr left the band, leaving the line up as a trio that consisted of front man Acerbus, bassist Gefandi Ör Andlät and drummer Daemonum Subeunt.

[2] Ondskapt's fourth studio album Grimoire Ordo Devus was released on 27 November 2020 through Osmose Productions.

Ondskapt are, according to their first release Slave Under His Immortal Will, ″merely an instrument of religious Devilworship, thus, the music and lyrics never would exist without the doctrinal as well as spiritual inversion of orthodox faith″.