Guarded by the Light no longer allows your Word of Glory to grant Holy Shield.
Holy Shield now costs 3% of base mana and has a 30 sec cooldown - Increases the amount your shield blocks by an additional 20% for 10 sec.
Oh blizzard you so scandalous. Now change Word of Glory back since it doesn't effect Prot's play style anymore. Or admit it was a Ret change all along.