Overall, I don't like the structure of domain=prestige.
-Pacifism seems unfun. Additionally this domain is granting more light spell power, but pacifism takes it back and kills the light crit chance. Would like it better if it read You gain 25 Positive Energy AND LIGHT Spell Power and 3% Positive Energy AND LIGHT Spell Critical Chance...
-Positive Energy Shield is a waste. At Cleric lvl 18, how about I just cast heal rather than prep my target w/some temp hit points and a little heal amp?