From wow.incgamers.com

Statistics

• Please note that there is no lower ranks of this spell, only Purify as it's predecessor.

Holy Tree

Talent: Purifying Power
Effect: Reduces the Mana cost of your Cleanse and Consecration spells and increases the Critical Strike chance of your Exorcism and Holy Wrath spells.
Statistics: Rank 1 = -5% mana cost and +10% crit, Rank 2 = -10% and +20%.

Talent: Divine Illumination Talent
Effect: Reduces the mana cost of all spells by 50% for 15 sec.
Statistics: N/A.

Protection Tree

None.

Retribution Tree

None.

Threat Level

This Spell generates Negligible Threat.

Uses in PvP

Please feel free to add a bullet list of uses within PvP or editorial if you have more to say. What use is it against other builds, what skills can it be used to counteract or prevent. What skills does it work well in combination with.

Uses in PvE

Please feel free to add a bullet list of uses within PvE or editorial if you have more to say. Which creatures/bosses in particular is it useful against. What skills does it work well in combination with.