Reactive Healing
System: Pathfinder | SRD
You can channel healing energy in response to an attack that would knock you unconscious.
When the damage from an attack or an effect would reduce you to 0 or fewer hit points, you can expend one use of channel energy (of a form that would heal you) or lay on hands as an immediate action to heal yourself. The healing affects only you, even if it would normally affect others.
Source: Advanced Class Guide pg. 155
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