Summoning heroes is a special game mode where you can summon a hero to your collection by opening Crystals.

One summon requires 1 Crystal or 100 Crystal shards.

There are 3 types of crystals: Rare, Epic and Legendary. Tap the “i” button in the “Summon heroes”  tab to find out what heroes you can summon from a specific Crystal, and what's their drop rate.