Summon

Players can level up units with souls. Souls are given as a reward for some activities, as well as for participating in battles.

But the main source of souls is the Summon. To make the Summon, players need Soul Stones or a resource. In the Summon, you can get souls both for upgrading existing units, and for getting a new unit for the collection.

There are two types of Summons in the game: Regular Summon and Great Summon. In the Regular Summon, players can get common and rare units, as well as epic ones in exceptional cases. In the Great Summon, players receive a Rare, Epic or Legendary unit.