Greater Shield Specialization

Choose one type of shield (buckler, light, heavy, or tower shield) for which you possess the Shield Specialization feat. With the selected shield, you gain a +2 bonus to your Armor Class against critical hit confirmation rolls (this bonus stacks with that from Shield Specialization). In addition, once per day you may negate a critical hit, and damage is instead rolled normally.

Choose one type of shield (buckler, light, heavy, or tower shield) for which you possess the Shield Specialization feat. With the selected shield, you gain a +2 bonus to your Armor Class against critical hit confirmation rolls (this bonus stacks with that from Shield Specialization). In addition, once per day you may negate a critical hit, and damage is instead rolled normally.

You can gain this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new type of shield.