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Ring of arcane might

(Magic Item Compendium, page 121)

Price (Item Level): 20,000 gp (15th)
Body Slot: Ring
Caster Level: 8th
Aura: Moderate; (DC 19) no school
Activation:
Weight:

This bronze ring is forged in the shape of a serpent devouring its own tail.

While wearing a ring of arcane might, you gain a +1 bonus to your arcane caster level for the purpose of spell penetration checks, caster level checks, and all level-based variables of any arcane spells you cast.

Prerequisites: Forge Ring, limited wish.
Cost to Create: 10,000 gp, 800 XP, 20 days.