The Beast of Nurgle is a Monstrosity Boss in Warhammer 40,000: Darktide. The boss moves slow and spits vomit everywhere, slowing you down.
The Beast of Nurgle is a very large enemy that does corrupting damage to your party, turning your healthbar purple. It has a vomit AOE attack and will also try to eat players who venture too close to its huge mouth. Players who get eaten are swallowed whole and will take constant corrupting damage until they are released. Effects that are capable of staggering monstrosities, such as the Ogryn charge ability, will force the boss to release a player. The Beast of Nurgle will often temporarily flee from the group after swallowing a player.
There is a large yellow buboe on the back of this enemy which is a weak spot - attacks that land here will do more damage.