The Ring of Saturn
It increases resistances: +15% electricity, +15% fire and +15% water. It
gives its wielder telepathy. It cannot be damaged by any means. When worn
and activated, it identifies an object, recharging every 50+d20 turns.
Level 50, Rarity 50, 0.2 lbs, 37500 Gold.

(EyAngband 0.5.2)