I know it may have been mentioned before, but as a suggestion, I think there should be an option to "trade-in" your old premium allies you don't use anymore. Maybe get half the gems back. Or maybe just be able to fuse them into your new ally like you would a weapon. If anyone else has any ideas of what we could do with our old premium allies we don't want to use anymore, please post below and maybe the dev's will incorporate our ideas