Promotion

Promotion or Eliting is one of the three ways to increase a character's stats, other than gaining levels or buying Support Cards.

You can promote a character with an extra copy of the card. This destroys the extra copy and causes it to go up an elite rank, but does not alter the character otherwise, including the level. It does not matter whether you level or promote a character first, they'll still arrive at the same maximum stats as dictated by their base stats. Promotions can be done up to 7 times (8 cards in total).