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Arcane Shield

You can convert any spell into a defense.

Prerequisites: Arcane spellcaster, caster level 10th.

Benefit: As a immediate action, you can sacrifice a prepared spell or unused spell slot of 1st level or higher and gain a deflection bonus to AC equal to the level of the spell or spell slot you sacrificed for 1 round. 0-level spells may not be sacrificed in this manner.