Once the Recruit menu is unlocked, players may recruit heroes to fight alongside them.
Heroes are bought with Herosouls which are acquired from card draws. Everyone gets 2 free draws per day. Additional cards may be drawn at the cost of gold or Diamonds.
Heroes have different classes and roles in the party. Some may be tanks; others may be strikers or healers.
Pay close attention to the hero descriptions. They include information regarding the various skills each hero uses. It also includes partner skills they may perform with other heroes. Party composition and formation are major determinants of battle effectiveness.
Each Angel has a Halo that provides stat boosts to designated positions party members can occupy.
Keep this in mind when deciding where to place your heroes.