SRD:Ring of Energy Resistance

Energy Resistance: This reddish iron ring continually protects the wearer from damage from one type of energy—acid, cold, electricity, fire, or sonic (chosen by the creator of the item; determine randomly if found as part of a treasure hoard). Each time the wearer would normally take such damage, subtract the ring’s resistance value from the damage dealt.

A minor ring of energy resistance grants 10 points of resistance. A major ring of energy resistance grants 20 points of resistance. A greater ring of energy resistance grants 30 points of resistance.

Faint (minor or major) or moderate (greater) abjuration; CL 3rd (minor), 7th (major), or 11th (greater); Forge Ring, resist energy; Price 12,000 gp (minor), 28,000 gp (major), 44,000 gp (greater).