Legacy of Astabar
Wondrous item, legendary
This iron bottle has a brass stopper. You can use an
action to speak the flask’s command word, targeting a
creature that you can see within 60 feet of you. If the
target is native to a plane of existence other than the one
you’re on, the target must succeed on a DC 17 Wisdom
saving throw or be trapped in the flask. If the target has
been trapped by the flask before, it has advantage on the
saving throw. Once trapped, a creature remains in the
flask until released. The flask can hold only one creature
at a time. A creature trapped in the flask doesn’t need to
breathe, eat, or drink and doesn’t age.
You can use an action to remove the flask’s stopper
and release the creature the flask contains. The creature
is friendly to you and your companions for 1 hour and
obeys your commands for that duration. If you give no
commands or give it a command that is likely to result
in its death, it defends itself but otherwise takes no
actions. At the end of the duration, the creature acts in
accordance with its normal disposition and alignment.
An identify spell reveals that a creature is inside
the flask, but the only way to determine the type of
creature is to open the flask.