Emergency Response (3.5e Feat)
From D&D Wiki
Emergency Response [Metamagic]
May cast Spells from the Healing Domain as Immediate Action.
Prerequisite: Quicken Spell
Benefit: Casting a Spell utilizing Emergency Response is an immediate action. You may cast only one Emergency Response spell per round. A spell whose casting time is more than 1 full round action cannot be used. An Emergency Response spell uses up a spell slot one level higher than the spell’s actual level. Casting an Emergency Response spell doesn’t provoke an attack of opportunity.
Normal: Spells are cast using casting times listed in the spell's description.
Special: This Metamagic feat cannot be affected by feats or effects that reduce the level of Spell Slot used in utilizing this feat