Mercenary Heroes have an innate ability to deal an extra 10% damage when attacking a weaker element. They also receive 10% more damage when being attacked by a Hero of the stronger element.
Mercenary Heroes also receive bonuses in the Mercenary Event stages. The bonuses increase with the amount of unique Mercenary Heroes that you have in your team.
- 1 Mercenary Hero - +4% increased attack and defense
- 2 Mercenary Heroes - +8% increased attack and defense
- 3 Mercenary Heroes - +12% increased attack and defense
- 4 Mercenary Heroes - +16% increased attack and defense
- 5 Mercenary Heroes - +20% increased attack and defense