Ring of The Toad (3.5e Equipment)
From D&D Wiki
Ring of The Toad: This ring is crafted with a fat toad as its insignia. The wearer gains 6 hit points that leave when the ring is removed. The wearer also gains a +5 bonus on saving throws against poisons and diseases that deal Constitution damage.
Moderate transmutationand abjuration;CL 7; Forge Ring, polymorph, neutralize poison; Market Price: 26,950gp