Anders Nyström (born 22 April 1975), also known as Blakkheim (or formerly Blackheim), is a Swedish extreme metal musician.

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?