Rare, Epic, and Legendary Heroes gain access to the Limit Break feature upon being fully leveled up and fully Ascended. Limit Break allows Heroes to surpass their natural power limit by increasing their maximum level by 5.

To Limit Break a Hero, you need a certain amount of special materials — called Aethers — that match the Hero's element. Players have a chance to obtain Aethers as rewards in Alliance Wars, Raid Tournaments, and certain Quests.

Aethers come in three rarities: Rare (Aether I), Epic (Aether II), and Legendary (Aether III). Limit Breaking Heroes of higher rarity will require Aethers of higher rarity.

Please note that the Limit Break feature is unlocked at Account Level 10.