Prayer of Mending

Prayer of Mending (PoM) is a level 50 reactive Holy priest healing buff similar to Earth Shield. It will not actually heal the target when cast on them, but instead place a buff on the target. When the buffed target takes any damage, the buff will heal the target, and move to another random raid member within 20 yards. The buff has 5 charges, and will not proc from environmental damage (falling, lava, fatigue, etc) nor damage that is absorbed, such as with Power Word: Shield. Spells that reduce the caster's own HP such as warlock's Life Tap will not proc PoM.

Improvements

 * Rapid Mending (honor talent)
 * The 4-piece bonus of Hallowed Raiment (level 70) increases healing done by this spell by 100 per proc.
 * The 2-piece bonus of the Heroes' Regalia of Faith (and Valorous, both level 80) increases the number of charges that PoM has to a total of 6.

Strategy
Prayer of Mending is often cast on the main tank before engaging combat, as it will begin the spell's 12-second cooldown and possibly allow mana regeneration before the fight begins. Waiting several seconds between casting the first Prayer of Mending and engaging combat allows a subsequent PoM to be cast immediately (or almost immediately) after the initial spell procs.

Prayer of Mending's benefits over other multiple-target heal spells include large range and low mana cost (particularly in situations where most or all of the charges proc). There are some drawbacks, however, including the long cooldown, inability to stack on multiple targets, inability to heal multiple targets simultaneously, inability to target the heal after the first proc, and a maximum of 5 procs every 12 seconds. That said, combining PoM and other group healing spells (e.g. Prayer of Healing, Circle of Healing, Tranquility) can be an extremely useful way to do a great deal of healing on a number of targets in a short period of time.

Prayer of Mending also lends itself to group healing during mob grinds, particularly where the priest themselves is capable of (albeit slowly) taking on a single mob at a time. Have each member of the party hold the aggro of separate mobs. As each person is hit, the PoM will bounce from one to the other doing the sustained healing; allowing the priest to take a break from healbotting. Whenever a damage dealer in the party finishes their mob, they should target a new mob instead of coming back to assist the priest. The goal is to spread the damage, and thus the chance for PoM to jump.