Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Diabolical Masquerade was a Swedish one-man black metal band with progressive influences. The band was formed in 1993 in Stockholm as side project of Anders Nyström (aka Blakkheim), known for his work as the guitarist of Katatonia. Diabolical Masquerade was a Swedish one-man black metal band. All music is written and played by Katatonia guitarist Anders "Blakkheim" Nyström, who wanted to have a band where he could compose more extreme music while Katatonia were exploring more mellow moods.