Adain's Emergency Shield

Adain’s Emergency Shield
Evocation [Force]
Level: Cleric 4, Sor/Wiz 4
Components: V, S
Casting Time: 1 immediate action
Range: Personal
Effect: 5 by 10 foot wall adjacent to the caster
Duration: See text
Saving Throw: None
Spell Resistance: No

This spell creates an impenetrable but transient flat barrier of force, similar to the wall of force spell. This spell can only be cast when the caster is targeted by an attack (as defined in the invisibility spell description).

The shield is a 5-foot wide, 10-foot tall wall that appears between the caster and whatever creature attacked her. When created, this wall is immobile, immune to all damage, and immune to all spells except as listed in the wall of force spell description. This wall can grant partial or total cover against any attack. The wall lasts until the start of the caster’s next turn and then immediately disappears.