User blog comment:FairyRaven/Fairy Tail Chapter 406: The Girl Within the Crystal, Review and Commentary/@comment-77.194.131.58-20141028093201

I have a theory : imagine if during her adventures, mavis was contacted by a time traveler, or by the CSK who explained her the true power of the tenrou jade and she decided to seal it inside her body to prevent evil hands to get it foolowing what happened with blue skull, thus she decided to be sealed ou of time understanding what will happen with Tartarus