A burst of Holy energy fills the caster, increasing armor by 720. Each melee or ranged damage hit against the priest will remove one charge. Lasts 10 min or until 20 charges are used.
If I'm not mistaken, that item was around in the WoW Friends & Family alpha. It certainly has nothing to do with the new spells from the Ruins of Ahn'Qiraj.
This is not that good anyway. Most 60 priests that are healing ahve alot +heal gear and use lover ranks anyway. I have 4 different FH on my bar depending on fight.
Healing ~1200 each heal now.