Ironclad

Any time your Avatar would take damage, you reduce that damage by 2, to a minimum of 0. Note that an enemy striking one of your sites causes life loss to your Avatar, not damage; life loss is not affected by this ability.

Each source of damage is reduced by 2. For example, if you attack and three Foot Soldiers defend together, you take 0 damage since each Foot Soldier would do 1 damage, which you reduce. As another example, if you are hit by an Arcane Barrage for 5, you take 0 damage, since each projectile would do 1 damage, which you reduce.