I would have to agree with Bym.. be carefull!
I have had horrible experiences with entitys contained in vessels.
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Definitely do some homework before opening that can of worms.
And while you are doing the research and until you are sure what
you plan to do, I would make certain to have lots of wards and protections
in place just in case.
It could be toying with you, it might not even be traped.