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Arcane Shield

Source Advanced Player's Guide pg. 150
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.

Mythic Arcane Shield

Source Mythic Adventures pg. 55
You sculpt spells into a powerful, enduring arcane barriers.

Prerequisites: Arcane ShieldAPG.

Benefit: You add half your tier to the def lection bonus granted to your AC when you use your Arcane Shield. You can expend one use of mythic power when using this feat to extend the duration to a number of rounds equal to your tier.