Level: Cleric 4
Components: V, DF
Casting Time: 1 immediate action
Range: Personal
Target: You
Duration: Instantaneous
A mantle of scintillating, multicolored light appears around you to block the spell, then fades away.
You cast mystic aegis immediately when you are targeted by a hostile spell. You gain spell resistance equal to 12 + your caster level against that spell.
Source: Player’s Handbook II, page 120.