Amulet of the Djinni

This holy relic is engraved with intricate air and thunder motifs on it.  While attuned to this artifact, when you have failed your third death saving throw, you do not die.  Instead, you stabilize and become unconscious for 1d4 hours.  Also, you, eight willing creatures (whom you must designate while you attune to this artifact), and all objects being worn and carried, are teleported into the pocket-dimension inside of the amulet.

The pocket-dimension is an extradimensional space in the shape of a 20-foot-radius cylinder, 20 feet high.  The interior is appointed with cushions and low tables and is a comfortable temperature. While inside, you and other creatures can hear the area around the amulet as if you were in its space.  All creature inside the amulet can remain their for up to eight hours, and leave at any time, teleported to a space within 5ft of the amulet.  Once a creature leaves the amulet, they can not re-enter again until the triggering event happens again.  At the end of the eight hours, all creatures and objects are safely ejected to a space within 5ft of the amulet.

Once the lamp has teleported the wearer and any other creatures, the amulet can not be used again in this way until the next dawn.