Constant fear that your fiendish nature might provoke a sudden attack ensures that you never completely let down your guard.
Benefit During the surprise round and before your first action in combat, you can apply half your Dexterity bonus (if any) to your AC. You still count as flat-footed for the purposes of attacks and effects.
Section 15: Copyright Notice – PPC:BoF
Pathfinder Player Companion: Blood of Fiends © 2012, Paizo Publishing, LLC; Authors: Hal Maclean and Colin McComb.