Invoker Utility 10Covenant of Endurance
You offer your life energy on your friends’ behalf.
Minor Action Personal
Effect: Until the end of the encounter, whenever an ally within 10 squares of you has an opportunity to spend a healing surge, you can spend a healing surge on that ally’s behalf as a free action. You spend the healing surge but regain no hit points, and the ally regains hit points as if he or she had spent a healing surge.
Published in Player's Handbook 2, page(s) 108.