Board Thread:General Discussion/@comment-6192846-20140111153519/@comment-25059472-20141025191715

Not just the ability of Eve and the spell that Elluka used on Michaela and Gumillia, but even the Body Swap Technique would be more accurately described as "transmigration of souls" than "reincarnation", as I can see, Elluka's speciality is make a soul change her vessel, not make a soul gain another body after death.