Ring of Arcane Supremacy

This ornate silver ring resembles a serpentine dragon consuming its own tail, in the classic ouroboros position. The band feels slightly warm to the touch, and the dragon’s eyes gleam brightly any time the wearer casts a spell.

A ring of arcane supremacy grants its wearer the ability to reroll a caster level check made to overcome spell resistance with an arcane spell or invocation. You must take the result of the reroll, even if it’s worse than the original roll.

You must declare that you are using the ring’s power before the DM declares whether your caster level check results in success or failure. It functions up to three times per day, but not more than once per round.

Prerequisites: Forge Ring, true casting.

Cost to Create: 6,000 gp, 480 XP, 12 days.

Source: Complete Mage, page 126.