When an upgrade for a Heroes Special Skill is available, it is indicated by a green arrow next to the Special Skill icon of the HeroIncreasing a Heroes Special Skill requires Skillbooks. There are 5 different rarities of Skillbooks:- Uncommon- Common- Epic- Rare- Legendary The higher the Special Skill levels (to a maximum of 10) the rarer the Skillbooks are to obtain.
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Puzzle Combat Game GUIDE