Mastery: Deep Healing

Deep Healing is the Mastery of Restoration shamans, improved by the mastery stat.

Deep Healing increases the potency of all healing spells relative to the current health level of the target. It causes healing spells to become more potent the lower a target's health has dropped.

In a nutshell, Deep Healing will make a Restoration shaman's healing become most powerful when it is needed the most.