Fallout Shelter Luck

This page describes the Luck implementation

Background
Each SPECIAL attribute increases dweller efficiency in various rooms, during combat or when performing certain tasks. Although attributes can only be trained to a maximum of 10, they can still be increased to up to 17 through clothing bonuses. These additional points will not be visible on the dweller's SPECIAL bars but can be checked by tapping/clicking the bars, which brings up a more comprehensive menu that lists any and all bonuses.

Gameplay
Luck determines if a production room also yields caps along with the normal room reward (or extra caps after a successful rush attempt). Luck also affects the chance of rush attempts succeeding.

In the wasteland, it increases the chances of finding items when dwellers go out on quests and explore locations in the wasteland. The higher the Luck, the better the items. During quest combat, it increases the speed at which the critical hit meter fills. In the wasteland, it increases the caps found.

Dwellers can improve their Luck in the Game room.