Darski was born Adam Michał Darski in Gdynia, Poland. He was raised Catholic and began to play the guitar at age eight. He likes to call himself Nergal (which comes from Babylonia mythology and is the god of plague and war). He founded the band Behemoth while he was just a teenager in 1991. Darski also is the main lyricist, composer and manager of the band. For a brief time, he called himself Holocausto, which was inspired by Beherit leader Nuclear Holocausto. He was a member of a band called Wolverine, which showed his skills at clean singing.