SRD:Ring of Virtuous Good

Virtuous Good
The wearer of this ring is constantly sheathed in a holy aura effect. It bestows one negative level on any evil creature that puts it on. The negative level remains as long as the ring is worn and disappears when the ring is removed. This negative level never results in actual level loss, but it cannot be over-come in any way (including restoration spells) while the ring is worn.

Caster Level: 15th; Prerequisites: Forge Ring, Forge Epic Ring, holy aura, creator must be good; Market Price: 250,000 gp; Cost to Create: 125,000 gp + 12,500 XP.