You can cast Detect Magic at will from the ring, requiring no spell slot or material components. The spell uses its normal casting time and concentration, and you use your spellcasting ability for it. If you have no spellcasting ability, your spellcasting ability modifier is +0.

You have Advantage on Wisdom (Insight) checks you make to determine whether a speaker is deliberately lying. This property does not reveal the truth, detect mistakes, or identify a statement the speaker sincerely believes to be true.

Once the bearer uses such proof in a public hearing, crowd, court, or council to overturn false testimony, the ring advances to its Book 2 state at the DM's discretion. A further one-month downtime project tracing a hidden lineage, redacted text, or political plot to its baseline origin point awakens its Book 3 state. Campaign milestones do not grant bonuses before their stated progression point.

The bearer can cast Zone of Truth once per Long Rest without a spell slot or material components. The spell uses its normal casting time and spell save DC; the bearer uses their spellcasting ability, or a +0 modifier if they lack one.

The bearer can cast Comprehend Languages at will from the ring, requiring no spell slot or material components and using its normal casting time and duration. The bearer also has Truesight out to 10 feet while their bare feet are touching stone or earth. The bearer can cast Zone of Truth twice per Long Rest from the ring; when casting it, the bearer can choose up to six creatures within the area, and each chosen creature automatically fails its initial Charisma saving throw against the spell. Later saving throws function normally.

Once per Short or Long Rest, when a creature you can see within 30 feet makes an attack roll, saving throw, or ability check and has Advantage on that roll because of an illusion, magical disguise, or falsified script, you can take a Reaction to remove that Advantage. The creature instead makes the roll with Disadvantage. This property does not affect Advantage from any other source.

At level 20, the ring's Truesight range becomes 30 feet and no longer requires the bearer's bare feet to touch stone or earth. When the bearer uses Expose Falsehood, the target's magical illusions and magical disguises are also suppressed for 1 hour, revealing the target's true form to everyone who can see it. This does not reveal private thoughts or intentions.