Heroes can be enhanced to improve their Attack and Defense. You can find this option in the Hero profile window.
There are 3 different types of Hero Enhance, with different costs and different bonuses. Copper Coin enhances also have a lower Maximum Enhancement than Gold Coin enhances. The maximum enhancement value will depend on your Hero_s Star Level and Rebirth Tier (which can be increased via Hero Rebirth).
Copper Coin enhancements cost 500 Copper Coins per refresh. Each refresh will randomly generate a value between -20 and +20. You can enhance your Hero as many times as you like until it reaches this maximum. If you are not happy with the value that was generated, you can choose not to apply it. To apply the Enhance, simply tap the _Enhance_ button.
There are two types of Gold Coin enhance, with one costing 10 Gold Coins per enhance, and another costing 60 Gold Coins per enhance. The maximum total enhancement for these is: (6-star heros) 7000; (5-star heros) 5000; (4-star heros) 3500; (3-star heros) 1500. The maximum enhancement value will depend on your Hero_s Star Level and Rebirth Tier (which can be increased via Hero Rebirth). You can enhance your Hero as many times as you like until it reaches this maximum. Each refresh will randomly generate a value between +5 and +38 for the 10 Gold Coin enhance, and between +30 and +229 for the 60 Gold Coin enhance. To start enhancing, simply tap the_ Enhance_ button.
From time to time, there will be events that double the bonuses gained from Hero Enhance, so keep an eye out for them.
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Game Guide for Age Of Warring Empire