Rarity

Rarity is an indicator assigned to each hero in Fire Emblem Heroes which determines their starting stats and unlockable skills. Each hero has a range of rarities from 1✯ to 5✯. Heroes obtained through summoning method have a range of rarities from 3✯ to 5✯.

Unlock Potential
Rarities lower than 5✯ can be increased by the Unlock Potential option available in game. Heroes will return to level 1 after each increasement, although their stats and skills will remain.