Discography CD. Magnus Devo Andersson is a well-known figure in extreme metal with notable stints in Marduk, Cardinal Sin, Overflash, and many more. He’s also the owner of Endarker Studio in Norrköping – a place regularly visited by recording artists from across the world. Before the studio, Devo along with Necrotech and Peter Härje, had an obscure project named Endarker that was intermittently active between 1986 and 1993. 11 songs in the ripping tradition of Bathory, Celtic Frost, Obscurity, and Mefisto were recorded.