How to obtain upgrade tokens

You obtain upgrade tokens through brawl boxes.  Each brawl box costs 100 gold but there is no guarantee you will get some upgrade tokens.

What to do with upgrade tokens

With upgrade tokens, you can make for favorite brawlers stronger.  You can purchase different crests, health, damage, or super to make that certain stat even stronger.  To upgrade a brawler, click their profile and then click the crests you would like to purchase.