Board Thread:Shadow Fight 3 Discussion/@comment-152.23.236.41-20180422035354/@comment-34263638-20180422060926

I think you should just spend them on booster packs since you won't be able to get shadow energy if you upgrade the items directly with coins/gems. Unless if you're planning to go for the special event, I doubt you're trying to aim for legendary items since they can get obsolete quite quickly (weapon, armor, helm, ranged weapon).