[pezezin]

In W40k the primary form of FTL travel is the Immaterium or Warp, a realm of pure psychic energy inhabited by the Chaos gods and countless demons. Spaceships traveling through the Warp need powerful protective shields lest they be possessed and consumed by said demons... which is exactly what happens in the movie.

https://warhammer40k.fandom.com/wiki/Immaterium

[nirav72]

Kinda reminds of the inter-dimensional angry aliens from The Expanse that made ships disappear when transiting through the ring gates.