Category 1: Campaign Hp, follows the regular scheme, 10 levels, 2% per level, goes up to a 20% boost
Category 2: Upgrading Cost Discount, follows scheme number 2, 1% per level, goes up to 10% reduction
Category 3: Fusing (from common to rare, rare to epic, etc.) Cost Discount, follows scheme number 2
This would be useful to speed up progress for newbies, and for higher ranked players to be able to finally spend their thousands of spare arena coins. The categories would still mainly be useful for newbies, since most higher ranked players have near unlimited gold and little need for campaign hp.
Please vote and lmk if you think this is a good idea, and how it could be reworked if you think it isn't