Partygoers, classified as Entity 67 in Backrooms lore, are tall bipedal humanoids with smooth, leathery yellow skin and a carved smile smeared with blood. Intelligent enough to set traps and operate machinery, they dwell mainly in Level Fun, a space dressed up as an endless celebration. With toothed appendages they latch onto a person and, irreversibly, turn the victim into another Partygoer.
The heart of the horror is assimilation disguised as a party. The threat approaches not as darkness but wearing the look of a merry feast, and once you are seized the victim becomes the next Partygoer. It is a horror fitting for a dweller of Level Fun, where deceptive safety is itself the trap.