The Underground must sneak through the sewers and crack 10 locks to open a vault. When the vault opens, you may choose to take the loot now, or attempt another heist for even better rewards.

• 3

  Crack 2 vault lock after a player combat win, and 3 after a player combat loss

• 4

  Crack 2 vault lock after a player combat win, and 4 after a player combat loss

• 5

  Crack 3 vault lock after a player combat win, and 5 after a player combat loss

• 6

  Crack 4 vault lock after a player combat win, and 7 after a player combat loss

When Heart units cast their Ability, your team gains stacking Ability Power for the rest of combat.

• 2

  +4 Ability Power

• 4

  +7 Ability Power

• 6

  +10 Ability Power

Every 5 seconds, the next attack instead fires a magic orb at a random target, which explodes for 50% Ability Power as magic damage.

• 2

  +25 Ability Power

• 4

  +60 Ability Power

• 6

  +95 Ability Power

• 8

  +140 Ability Power, Orb Damage 150%