Boost level in bonus tab

1.hengstanley@yahoo.com.sg » Fri Dec 29, 2017 6:59 am

Can moderator or any expert help to explained the boost level found in bonus tab? It is temporary boost to lvl 90 ? If yes , what is the duration? And what is the purpose for it? Heroes competition? Build home? Do I get to keep the items for return chest 1?
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