HDK (Hate, Death, Kill) is a musical project of Dutch guitarist Sander Gommans, best known as member, vocalist and one of the main composers of the now dissolved symphonic metal band After Forever.

Gommans' purpose was to produce music more extreme than After Forever's usual symphonic metal, which needed a different output.

Gommans' activities as art teacher and member of After Forever and his poor health condition slowed down the creative process of the band, until 2008.

With the interruption of After Forever activities, HDK was able to finally produce its first full-length album System Overload, which was released on 23 February 2009 on the label Season of Mist.

[1] In 2014, HDK released their second album called Serenades of the Netherworld, with a fixed line-up composed of Gommans on guitar and bass, Amanda Somerville and Geert Kroes on vocals, Koen Herfst on drums and Uri Dijk and Erik van Ittersum on keyboards, along with some guest instrumentalists.