Your creations last longer than expected.

Encounter   ✦     Arcane, Healing
Immediate Interrupt      Close burst 10

Trigger: A creature you summoned with an artificer or clockwork engineer power takes damage

Target: The triggering summoned creature

Effect: You spend a healing surge, and the target regains hit points equal to your healing surge value + 2d6.

Published in Eberron Player's Guide, page(s) 61.