Mask Hysteria

Mask Hysteria is an overseer quest and part of the Mystery of Vault 31 multi-stage questline in Fallout Shelter.

Walkthrough
In the building, which has a random layout, there are several groups of feral ghouls you must fight, in groups of two to four. You may also encounter an irradiated ghoul among them. The ghouls you are looking for are found near the top of the level. The first and third dialogue options avoid the fight, while the second and fourth options end in combat. You retrieve the Ghost Costumes here.

Gallery
Histeria enmascarada