She began modeling, starring in a Martin Scorsese-directed Chanel advertisement and the music video for The Lonely Island's 2011 song "Jack Sparrow" featuring Michael Bolton.

In 2013, Amalie also appeared on R.A. the Rugged Man's album Legends Never Die, providing background and chorus vocals for track 3, "Definition of a Rap Flow".

Both Ex Cops and Myrkur have garnered Bruun critical acclaim from publications including Pitchfork,[5] Spin,[6] and NPR Music.

[17] Her debut album under the Myrkur moniker, M, was produced by Ulver frontman Kristoffer Rygg and featured members of Mayhem, Arch Enemy and Satyricon in her backing band.

[18] Bruun received a torrent of sexist backlash from metal fans after beginning the Myrkur project, at one point deactivating her Facebook account because of endless death threats.

[16] Bruun also appeared on the EP The Alchemy Project by the Dutch symphonic metal band Epica, on the song "Sirens – Of Blood and Water", alongside Charlotte Wessels.

[21] In 2018, Bruun married the American drummer and personal trainer Keith Abrami, known for playing drums in death metal bands Artificial Brain and Shredded.