You can use hero you don't need and gold to upgrade your hero.
During enhance phase, the hero you put in will disappear, but hero's equipment will auto back to inventory.
Skill Enhance:
Click hero skill icon to open skill upgrade UI
You can use sunstones to upgrade hero skill. (You can get sunstones by dismissing heros or in Sanctum)
Skill Type Info:
Auto Attack:Hero's normal attack, it is auto spell.
Quick Attack:Click hero avatar icon to spell, no cooldown time, it can be spell again after mana recovered.
Heavy Attack:Slid upward hero avatar icon to spell, after spell skill will be on cooldown, it can be spell again after mana recovered.
Ultimate Attack:When the ultimate gauge has filled enough, you can unleash destruction upon your enemies by tapping the ultimate skill.
Passive Ability:When the hero be setup as leader will trigger Passive Ability.
【Status】
ATK: Hero's attack value, higher value means higher damage.
DEF: Hero's defense damage value, will affect damage reduction rate.
HP: Health points, hero will die when HP drops to zero.
Crit: Critical hit value, will affect critical rate.
AGI:Agile value, will affect auto attack speed, mana recover speed and evade rate .
Mind:Intelligence value, will affect mana recover amount while injured, increase hit rate while hero spell debuff to opponent and increase debuff resist rate.