Wondrous Item, Rare
Once per long rest, you can choose to let the necklace burst with green energy, spawning magical gas that influences the minds around you, spawning delusions and hallucinations. Each creature in a 3-meter-radius sphere centered on a you must succeed on a DL 15 Will saving throw.
On a failed save, an affected target is paralyzed for 1d4 hours, or until they take any damage. Every 10 minutes, a paralyzed creature can repeat the saving throw, losing the effect on a successful save.