Truth Serum

Adventuring gear, poison (ingested)

• Properties: Poison
• Cost: 150 gp

A creature subjected to Truth Serum must succeed on a DC 11 Constitution saving throw or have the Poisoned condition for 1 hour. The Poisoned creature can’t knowingly communicate a lie.

Source: Dungeon Master’s Guide (2024) p. 91. Available in the SRD