Ring of Truth (3.5e Equipment)
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This metal band has two powerful enchantments. To begin with, it allows its wearer to discern lies at will (Will save DC 14). However, the wearer himself must speak the truth, as if he was under the influence of zone of truth. There is no save against this second effect. These rings are often used to force prisoners to speak the truth, but are also quite useful for characters engaged in espionage — although enforced honesty can prove to be quite dangerous for a spy.
Moderate divination; CL 9th; Forge Ring, discern lies, zone of truth; Price 75,000 gp