There are free, public and private unions in the game. Free unions automatically group random players basing on different aspects. If you take part in a free union, you'll automatically be expelled in case you don't enter the game with a stable Internet connection for some time. The higher your game level is, the longer you stay in the free union while inactive.
Public unions are created by players and available to all willing to join. On the contrary, private unions are accessed via leader approved invites only. The leader is the only one who can remove players from these types of union.
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