Each Hero can be promoted after reaching a certain level to significantly boost the Hero’s stats. You can Promote a Hero by:

1. Selecting it from your Hero Roster
2. Pressing “Promote”. The number of levels needed for Promotion can be viewed on each Hero’s Promotion screen.

Heroes also need special Promotion Materials in order to Promote them. High-level promotion materials are rare by design.

The more stars a Hero has, the more times it can be promoted.

It’s important to note, Promoted Heroes will reset back to level 1 but their power will be far greater than it was before.