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When upgrading ur tower's somewhere it said something about using a hero on the tower or using a hero to enhance the tower. Which tower (arrow, magic or cannon) and what level can u do it at
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You can do it on all three after you.upgrade it to one of them. It's an option that you.get when you select the tower from your base called garrison.
Once you upgrade the normal tower to 10, you're given a choice to switch between keeping Arrow Tower (normal) or getting Magic Tower or Canon.
Garrisons are based off of the hero's level in the towers.