Index entry
Diadem of Fabulous Truthiness
You have advantage on Charisma (Persuasion) checks when appealing to someone’s sense of truth or justice. You can cast Zone of Truth once per day (save DC 15) without expending a spell slot.
Complete rules
Compelling Credibility You have advantage on Charisma (Persuasion) checks when appealing to someone’s sense of truth or justice. Zone of Truth You can cast Zone of Truth once per day (save DC 15) without expending a spell slot. Lie-Glow Tell When a creature within 30 feet tells a deliberate lie, the diadem emits a noticeable crimson-gold shimmer. Until the end of your next turn, you have disadvantage on Dexterity (Stealth) checks to avoid being noticed.