Union events are available to union members only. The event starts and ends simultaneously for all players. To achieve the event goal and earn rewards, union members must collect a certain number of special items in the game.
These items, gathered by all union members, are added together. If a player leaves a union, the union's total number of collected items decreases.
Each participant's contribution is shown on the leaderboard. Union members participating in the event receive milestone prizes as they progress and a grand prize for having achieved the event goal.