Holy Power is a talent in the Holy tree which requires 25 points in Holy to max it. It increases the critical effect chance of your Holy spells. Many paladin abilities are unpredictable or ambiguous in regard to whether they use melee or spell mechanics. Generally, Retribution abilities will use melee mechanics, while Holy and Protection abilities will use spell mechanics. This talent affects spell crit mechanics.
[Holy Shield] may have been given a critical hit chance in a recent patch (unverified). It was originally incapable.
[Avenger's Shield] sources offer conflicting information about whether it relies on spell or melee crit mechanics. The majority seem to favor melee crit.
[Consecration] is an area DoT and thus incapable of a critical hit.
