On May 17th, 2019 the band announced that they would "enter the studio" in mid June to start working for seven weeks on their long-awaited fourth full-length album for a tentative 2020 release, recording was completed in mid October after a five month process, and received the master in November. They also added guitarist C. B. as another session and live member, while J. Megiddo became the band's official guitarist. In March 2020, Gefandi Ör Andlät left the band "for personal reasons" which delayed the album's release. Ondskapt's fourth studio album "Grimoire Ordo Devus" was released on November 27th, 2020 through Osmose Productions.