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 there are several groups of feral ghouls you must fight. The ghouls you are looking for are on the far right of the topmost level. Depending on your answer to their question, it may or may not end in combat. You retrieve the Ghost Costumes here.

Gallery
Histeria enmascarada