Armor Increase is a buff that increases hero's armor and reduces the incoming Damage.
It can be cast on hero and their teammates.
While in the battle, you can tap and hold the Buff icon and read what it does.
Here's a list of heroes who can apply this buff:

  • Victoria (Ability 3)
  • Darian (Ability 2)
  • Eric Shieldbreaker (Ability 3)
  • Solius (Passive Ability and Ability 3)
  • Mortha (Ability 3)
  • Sabator (Ability 3)
  • Major Shott (Leadership Ability)
  • McRat (Ability 2)
  • Kin Li (Ability 3)
  • Hilda (Ability 2)
  • Kang Xi (Ability 3)
  • Boreas (Passive Ability)
  • Salvador (Passive Ability and Ability 3 - Steel Shell)
  • Rawley (Ability 2)
  • Hell Kitty (Ability 3)
  • Baldur (Leadership Ability)
  • Cent & Turion (Passive Ability and Ability 3)
  • Ambu & Lance (Ability 3)

  • Bar & Rel (Passive Ability)
  • Kirri (Ability 3)
  • Shadar (Ability 3)
  • Megawheel (Passive ability - Tourment)
  • Buff (Ability 2 - one of the possible buffs)