The power level of a hero is determined by their Star value. A hero with a higher level Star value is generally much stronger. The highest star value for a hero is 6.
Heroes have 4 Attributes:
Growth: This is the most important attribute, denoting how much of the other attributes a hero gains per level. Putting a hero through Rebirth can increase their growth.
Command: This attribute denotes how many troops a hero can lead into battle. Command can be increased by leveling up, equipping a necklace, putting gems into said necklace, or using a Leadership Card (for a temporary buff).
Attack: This attribute can be increased by leveling up, hero enhancement, equipping a weapon, putting gems into said weapon, or activating an attack-enhancing buff with an attack bonus or military bonus card.
Defense: This attribute can be increased by leveling up, hero enhancement, equipping armor, putting gems into said armor, or activating a defense-enhancing buff with a defense bonus or military bonus card.
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Game Guide for Age Of Warring Empire