Units can be Evolved with the proper material units once they reach max level. To evolve normal units (pullable units), a special 'Mana Egg' unit is required. Limited Edition units (event reward units) require "Mana Orbs" alongside "Mana Eggs" to Evolve. Depending on the unit's rarity, the amount and rarity of Mana Eggs and Orbs necessary to Evolve rises. By using Evolve, a unit's rarity, maximum level and base status will rise. Units can be Evolved a maximum of 2 times. The unit's level and skill level remain the same even after being Evolved.
Mana Eggs and Mana Orbs can be combined and evolved into Mana Eggs and Mana Orbs of higher rarities. Evolving a Mana Egg typically requires six Mana Eggs that are of the same element, Evolving Mana Orbs requires three Mana Orbs.