In 2021, Mayhem was inducted into the Rockheim Hall Of Fame, after being nominated for the third time earlier the same year. As of 2021, they are the only black metal group to be inducted. 

Mayhem announced a new EP Atavistic Black Disorder / Kommando due for release on 9 July 2021. The tracklisting will consist of 3 outtakes from the Daemon sessions, two of which were used as bonus tracks on the deluxe edition of the album along with 4 cover songs from punk rock bands who the band cite as "laying the foundation of what was to come". The band also announced the EP will feature guest appearances by former vocalists Messiah and Maniac on one cover track each.

This will mark Messiah and Maniac's first studio recordings with the band since 1987's Deathcrush and 2004's Chimera respectively. Necrobutcher stated the two former vocalist were brought in "because of their obvious connection with punk"