promotion is based on ur crystal level i balive level 20 starts the purple hero. shrug i could be wrong its been a bit lol. hero levels has nothing to do with personal level its the crystal level of ur hero. best way to get those crystals is complete ur daily’s and in magnet. magnet gives u 30 a day. best way to do magnet is save shards for shard store. and use them for points. as well as hord yellow boxes and open them in event heck save every box from everywhere. war chest mount chest from wb and so on save all and open in magnet for points. good luck