Nils Fjellström was drummer in Swedish technical death metallers Aeon until he departed in September 2010. He had joined the group in 2002, replacing original sticksman Arttu Malkki.



Nils Fjellström and Aeon had parted ways before, but reunited in 2008.



In September 2010, Nils Fjellström announced his withdrawal from Aeon and from Dark Funeral for personal reasons.



In June 2012 Nils Fjellström joined Netherbird, after the band's previous drummer Erik Röjås had departed. Nils premiered with Netherbird on June 2nd during a gig in Stockholm.