Hero Level and Stats
Each hero can be upgraded to level 15. Heroes of the same type at different levels have the same attribute value types, and the higher the level, the greater the value.
Each hero has 3 levels of rarity, which can be used to increase rarity stages by combining heroes of the same type.
Once a rarity stage is raised, and heroes can get additional attribute skills. During the merging process, the low-level heroes among them will be consumed.