The Haunting of Mass Chemical

The Haunting of Mass Chemical is a limited time overseer quest in Fallout Shelter, available during the fall.

Walkthrough
This quest takes place in a cyan building. Enemies encountered may include feral ghouls, sometimes with irradiated feral ghouls. When you come across the raiders, selecting the first dialogue option can avoid a fight. Either way, a lunchbox and a rare weapon are rewarded. The room they are in also contains a rare outfit.