Extra Energy is the additional Energy that a hero or their allies get at the start of the battle. During a battle more energy can gained or the hero can lose energy.
Some Heroes, like Augustus, get the Quick StarterTrait through Ascensions, which gives them additional Energy at the start of the dungeon run or Raid, which is needed to use their special attacks/abilities.
Other Heroes gain extra Energy by a Trait when they are teamed up with other heroes of a certain Family or Class. Archon is an example of such a hero. Again, other Heroes, such as Ekko, provide certain Heroes on their team extra energy when you bring them together.
Through clever team building you can have certain hero abilities ready for battle (Starts Powered)
Will of the Wisp (Trait): Immune to Spirit, Lightning, and Light attacks. High resistance (75%) to Paralysis. [Light allies start Dungeons with +1 extra energy]. The text in [brackets] is of rank II of this trait (I/II).
Spirit Link (Special Attack): Creates a link between target ally (or self) to a random enemy that steals buffs and healing from enemy, and transfers [x%] damage and debuffs to enemy by giving the ally a buff and the target a debuff. Lasts 3 turns, can't be dodged. Starts partly charged, requires +1 energy to be Powered. The [percentage] increases with level.
Spirit Link (Special Attack): A Spirit Link is established between the attacker and the target by giving the attacker a buff and the target a debuff. Reflects [x%] damage and debuffs to target enemy, and steals healing and Buffs from target enemy as long as the Link is active. Lasts for 3 turns. Can't be dodged. Starts partly charged, requires +1 energy to be Powered. The [percentage] increases with the level.
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