Meekstone

A beautiful ruby crystal, wrapped in intricate gold decoration, which seems to always exude an oppressive force. Once per long rest, as an action, you can speak the command word to activate the stone. The stone stays active for 10 minutes, and may be deactivated early using an action to speak the command word again. During this time, creatures of CR 3 or greater within 100 feet move at half speed, and must succeed on a DC 25 Constitution saving throw every time they attempt to take any action. On a failed save, the creature does not take any actions, and suffers one level of exhaustion. On a successful save, the creature is able to take its action, but is unable to take any actions on their next turn if the stone is still active.