Heroes are categorized into different classes: Common, Rare, Epic, Legend. Common heroes are easier to collect but have low growth rate. Rare heroes are more difficult with better growth rate. Legend heroes are the hardest to collect with strong ability and highest growth rate. Each hero has different abilities, you can choose the heroes into your deck. Only heroes in a deck can be summoned in battle.
In normal PvP mode, monsters will arrive from portals and go around your defense to your base. You have to summon your heroes to defeat the monsters and earn gems. Use the gems to summon more heroes. You can merge similar heroes together to make a more powerful hero with higher attack power and health point. Each time you merge 2 similar heroes, a randomized hero will be born, so think carefully before merging.
Beside playing PvP against players, you can also join COOP to defend your base with another player. Monsters will go from 2 portals to your team's base. You have to summon heroes and merge them to defeat all monsters before they reach your tower. Your coop player can help you out when the monsters are in range.
After each matches you can collect gold and diamonds. You can use gold and diamonds to purchase chests. Open the chests to receive random heroes fragments. Collect enough fragments to upgrade your heroes! There are many different chests. Better chests will give higher level heroes fragments. Collect Legend heroes to have a better chance to win!
Skill is required, but Luck is mandatory!