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After freeing him and Bottle from the raiders in Fallout Shelter, the pair will appear in your vault from time to time, and appear immediately the first time. They provide a temporary 15% happiness increase to every dweller in the vault, regardless of which room Bottle and Cappy are in. After they leave, dweller happiness is returned to their previous level. This can greatly help those who have many dwellers with low happiness. Tapping either one of the mascots when they stop and dance will yield some caps, with Bottle occasionally yielding some Nuka Cola Quantum.