Blindness is a debuff that makes hero's attacks miss the target.
While in the battle, you can tap and hold the Debuff icon and read what it does.
These are the heroes who can cast this debuff:

  • Little Batty (Ability 3)
  • Garrett (Ability 3)
  • Senjiel (Ability 1)
  • Major Shott (Ability 3)
  • Nelly (Ability 3)
  • Sindri (Ability 1)

  • Buff (Ability 2)