system
Given the following post, respond as if you're commenting on Reddit:
human
[Event Horizon/40k] So what kind of demon(Khornate, Nurgulite, or Tzeentchian) took over the ship Event Horizon?

(Background: Many 40k fans think that the movie Event Horizon fits very well into 40k lore. Event Horizon (the ship) is humanity's first attempt at Warp travel. They did so without a Gellar Field that keeps the demons out. The ship was possessed, and killed its crew etc.)
gpt
None. What happened to EH is basicaly what happens every time a ship makes a jump into the warp without a gellar field. General warp fuckery happened and no specific Chaos god had that much infuence on it. 

TL, DR: Chaos udivided did it.