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First stage

The first stage is automatically unlocked once you have gained access to the Grace of Growth feature. Once applied, the hero will immediately upgrade to a 5* rating and level 50, the highest level of a 5* rated hero.

Second stage
The second stage is unlocked after the player has had 3 different heroes at level 50. Once applied, the hero's potential will immediately unlock to a maximum of 5* and their skill will improve by +3, which will allow you to get the special potential skill upgrade. and boosting his damage potential.
third stage
The third stage is unlocked once the player has had 3 6* heroes at level 60. Once applied, the hero will be further enhanced and their rarity will increase to 6*, their level will increase to 60, they will have their potential. fully unlocked and his skill upgraded to +9.
Final stage
The final stage is unlocked after the player has upgraded a natural hero's skill level from 5* to a maximum of +15 skill levels. Once applied, the hero's skill level will further improve to +12, allowing them to fully upgrade 2 skills and have all of their special skills unlocked and usable.