All-star Swedish death metal group Bloodbath was the side project of Opeth vocalist Mikael Akerfeldt, Katatonia guitarist Blackheim and bassist Jonas Renkse, and Edge of Sanity drummer Dan Swano. Their debut EP Breeding Death was released in early 2000. . All-star Swedish death metal group Bloodbath was the side project of Opeth vocalist Mikael Akerfeldt, Katatonia guitarist Blackheim and bassist Jonas Renkse, and Edge of Sanity drummer Dan Swano. Their debut EP Breeding Death was released in early 2000.