Amber Paddock

This fine necklace is formed of a large polished amber stone, wrapped in mithral filigree and chains. It was made by Caleb Widowghast in an effort to replicate Purvan Sul's "Raven's Slumber" necklace of legend, using a more permanent verion of the Secret Chest spell. Once you designate a creature within 60ft. (no action required) you may use the following actions.

• Use an action to bring the creature nto the necklace, transporting them to a small demiplane. If you're to designate an unwilling creature, they must succeed a DC:17 Wisdom saving throw to resist being brought into the necklace. 
• Use a bonus action to release the creature within demiplane, appearing in a space within 60ft.
• If the last creature to enter the demiplane falls unconscious within 60ft. it immediately enters the demiplane and is stabilized within 3 rounds.