Skills are heroes' abilities that are used in battles. The higher the skill level is, the more damage it deals. You can level up skills using skill points - they are accumulating as time goes by:
Each level up will cost you some gold:
The first skill in the list is an ultimate one. It can be used when the hero's Energy is full.
If you fight in Auto mode (the Auto button is enabled) all skills are used automatically.
If you fight in Manual mode (the Auto button is disabled) you can choose when to use the ultimate skill by clicking on its icon. Remember - you can use it only when the hero has full Energy!
Important: you can fight on the Arena in Auto mode only. The Manual mode is available in PvE battles.
New skills are unlocked when you promote the hero to the next color (to Green, Blue or Purple rank).