From DDO wiki
A deflection bonus affects Armor Class and is granted by a spell or magic effect that makes attacks veer off harmlessly. Deflection bonuses stack with all other bonuses to AC except other deflection bonuses.
Sources of Deflection bonuses:
- Shield of Faith +2-5 (exact formula: 2 + (caster level / 6), rounded down)
- Protection from Evil +2 (from attacks from evil creatures) Bug: Protection from Evil is bugged and the +2 AC and save bonus from it counts as a sacred bonus so it stacks with other sources of deflection AC.
- Protection from Chaos +2 (from attacks from chaotic creatures; only on named items such as Chaosgarde bracers at this time)