Anders Nyström (born 22 April 1975), also known as Blakkheim (or formerly Blackheim), is a Swedish musician, best known as a founding member of Katatonia and Bloodbath alongside Jonas Renkse Nyström founded the Swedish metal band Katatonia with Jonas Renkse in 1991.

Nyström is involved in the songwriting, guitars, backing vocals, keyboards, programming, arrangements, art direction and production of Katatonia along with Renkse.

[1] Nystrom says he perceives heavy metal guitar riffs as "small themes" fit for a horror film soundtrack.

He has cited Entombed vocalist/drummer Nicke Andersson's approach to death metal as having significantly influenced him.

Imagine if the guy from Nihilist hadn’t have crossed that HM-2 pedal with that amp to find that overload of sound?