Random Magic Armor (any level)

Shield, Small, steel
valued at 8,159 gp.
Spell Resistance SR13 Ability

This enchantment grants the armor's wearer spell resistance while the armor is worn. The spell resistance can be SR 13, SR 15, SR 17, or SR 19, depending on the armor. For SR 13:
Aura: Strong abjuration
Caster Level: 15th
Requirements: Craft Magic Arms and Armor, Spell Resistance
Price: +2 bonus
Source: Dungeon Master's Guide v.3.5

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