Shield Wall skill icon.
Permits your hero to become invincible (Unstoppable if all Immunities are granted). Once you pick your final active skill in the skill tree, you will never be able to pick the other choice, in Fighter's condition, the other skill is Cleave. This skill can only be learned once and can not be modified by any other skill. This is one of the most handy skill in this game. Rendering your hero invincible for a short mount of time is very helpful specially to hard fights.
1/1 : Become invincible to all attacks for 12 seconds.
Shield Wall skill description.