The Mystic Tower is to the lefthand side of the base. The purpose of the tower is to provide an opportunity to watch the "Mystic Vision", a short advertisement, in return for a small in game reward. You can watch 3 videos before there is an 2 hour cooldown before you may watch another.
Possible Rewards[]
As a reward you may receive anything from 2 items, up to 5. A typical reward includes (1) a low level ascension material, (2) a few gems, (3) a summon token.
It is possible to receive rare ascension materials, an epic hero token, or epic troop token. The chances are low, but make viewing the Mystic Vision a worth the time.