Ally progression

Allies can be raised to have higher stats and skills. The following is a list of what the player can do to allies.

Bond
The player can increase their bond with an ally by clearing intimacy rooms. Each time they clear a room, their bond will increase by 1 up to a maximum of 5.

Level Up
Use coins and Holy Water to level up and strengthen the player allies. The maximum level of their allies is limited by the player current player level.

Ascension
Use coins and the corresponding Essence Fragments (and for the 5th ascension) to raise the star ranking of the player allies. Certain passive skills can only be unlocked through ascensions, and battle skills can only be upgraded through ascensions.

Potential
Use coins and materials to unlock an ally's potential and raise his ATK and HP stats. Certain passive skills, like Potential Skills, can only be attained through unlocking potential.

Potentials divided into tiers where N/R-rarity allies have 6 tiers, while SR/SSR-rarity allies have 12 tiers. To reach the next tier, the player must unlock all six potentials in the current tier.