Ring of Arcane Might

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, 1,100 XP, 20 days.

Source: Magic Item Compendium, page 121. Originally published in Complete Arcane, page 144.