"You truly make me feel sick, Waluk."
Gu Hang said this from the heart.
He doesn't like cursing enemies, whether they are traitors, Chaos, or Alien. Even though mercilessly killing them is Gu Hang's duty, it's merely a matter of position, a responsibility.
Even when encountering the seemingly most disgusting enemies, like Plague Demons and followers of the Father, Gu Hang would only purify them with a calm face. Those cysts, boils, and secretions indeed seem disgusting but are merely physiological revulsions.
But the things Gu Hang saw upon entering Waluk's grand cathedral truly made him feel sick psychologically.
It's quite expected that Waluk's mechanical ark has a grand cathedral. In fact, in the Empire's starships, a cathedral is a regular fixture, and many large starships even have more than one.