Alliance Boosts can be unlocked for all members of your Alliance by participating in the Pro-Leagues. They are unlocked by earning Alliance Pro-Score, which is the combined score of all Alliance members participating in the Pro-League. The Pro-Boost for that week will be unlocked at the end of Pro-League after reaching a particular milestone and, like War Season Boosts, can be prolonged until the next Pro-Event in which the boost can be won again!
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