How to upgrade heroes?
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How to upgrade heroes?
Tap the heroes icon at the bottom of the main screen, this will bring up the heroes roster.
Now select a hero that you have unlocked already and select the upgrade option, you can then use auto upgrade to use all the upgrade materials that you have on this hero.
If you don't want to use all your upgrade materials at once just drop the levels after selecting auto upgrade so not all materials get used up and you can use whats left on another hero.
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