At the last second, you create a shield made of fey magic that appears between your ally and danger, giving the ally a moment to recover and keep fighting.

Daily   ✦     Arcane, Healing
Immediate Interrupt      Ranged 10

Trigger: An ally within 10 squares of you drops below 1 hit point.

Target: The triggering ally

Effect: The ally instead has 1 hit point and can spend a healing surge, regaining additional hit points equal to 10 + your Intelligence modifier.

Published in Heroes of the Feywild, page(s) 65.