This is a system where you Fuse, Enhance, and Mutate Heroes. When you Fuse two Heroes both with 5 upgrades points, both Heroes will disappear and provide you with a new Hero which is a grade higher than the two Heroes you Fused. Enhance combines identical Heroes into one stronger Hero. The normal Master level is 30, but an Enhanced Hero can go up to level 33. More enhancements raise the maximum level. Only Heroes that haven't mastered level 30 can Mutate, and this reincarnates that Hero into another random Hero. You can only Mutate a Hero when you are given the option to do so.