Total defense

Sometimes it’s more important to guard against further injury than to attack. In such circumstances, a creature focuses its attention on defense.

Use Total Defense
         Action: Standard action.
         +2 Bonus to All Defenses: The creature gains a +2 bonus to all defenses until the start of its next turn.

Published in Player's Handbook, page(s) 292, Rules Compendium, page(s) 251.