[5][verification needed] In the late 1990s, he was a vocalist and guitarist of the Danzig-influenced band, Wolverine,[6] which was showcasing Nergal's capability of clean singing.

He is also known for his contributions with the following bands: Hermh, Nile, Damnation, Vader, Sweet Noise, Mastiphal, December's Fire, Mess Age, Corruption, Hangover, Ex Deo, and Hefeystos.

Inspired by Norway's Black Circle, Nergal formed together with Blasphemous (from the band Veles) and Venom (from Xantotol) the Temple of Infernal Fire.

This led to remaining members of the Temple of Fullmoon to accuse Behemoth of betrayal and caused tensions between Nergal and Rob Darken, frontman of the Polish NSBM band Graveland, leading to death threats.

[8] In March 2010, Nergal was held on trial in Poland on blasphemy charges for publicly denouncing religion by ripping up a Bible on stage in 2007.

Darski reportedly donated the majority of funds for this limited edition placement to one of the world's most renowned bone marrow donor centers.

[13][14][failed verification] Nergal started a solo project alongside John Porter called Me and that Man, which focuses on country, blues and folk.

[25][26] On 8 November 2010, following his then-girlfriend's appeal to the wider public, which has been met with a great response, Darski underwent treatment to receive a bone marrow transplant.

[27] Nergal was discharged from the Uniwersyteckie Centrum Kliniczne (UCK) hospital in Gdańsk on 16 January 2011, three weeks after undergoing a bone marrow transplantation.