TITANS
Why on this good earth would you use Armor of Light when Blessing is a more viable option since you still retain the over shield? If you use AoL, you have to be in the middle of the bubble. But with BoL, you can just stick a toe in and get that over shield.
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The over shield from armor of light is MUCH stronger than the shield from blessing of light. In situations where you don't need to leave the bubble (like capping or defending a point in pvp) armor of light is a better choice.