Command of Steel

+5% Chance to Block Attack Damage while holding a Shield
30% increased Attack Damage while holding a Shield [1]

Command of Steel is a notable passive skill that grants additional chance to block with a shield equipped. It also grants increased armour rating, evasion rating, and energy shield from equipped shields.^[1]

Version history

Version	Changes
1.2.0	The area surrounding the Witch, Shadow and Ranger has been redesigned. Many clusters throughout the tree now have new notables.

↑ Mark_GGG (March 13, 2013). "Increased Shield Defenses?". Official Path of Exile Forums. Retrieved July 19, 2013.