From OSE SRD
A 3’ tall, weighty jug with a sealed stopper. Breaking the seal and removing the stopper releases a trapped efreeti (see Efreeti (Lesser)), who will serve the character.
- Frequency of service: The efreeti will serve the one who freed it (and only that character) once per day.
- Duration: After 101 days, its service ends. The creature then returns to its home—the legendary City of Brass.
- If the efreeti is killed: Its service ends.