Board Thread:Theories/@comment-25322628-20151223003430/@comment-25322628-20160521003243

To X29: An old spirit residing in someone else's body has been done as far as the original FMA with Dante and the Philosopher's Stone, only that's body snatching, a crime punishable through the law of equivalence, since anyone using the stone wouldn't be able to do it forever. Anyone, the First King's ideology is all that remains of the First King when the Coordinate is passes down through the Reiss family. It's nothing but a belief hardwired into a descendant's mind.

To everyone else: This question reinforces the Titan Shifting ability. Say the Titan Serum didn't just affect the spinal column, but affected the entirety of the person, like how the Super Soldier Serum affected Steve Rogers/Captain America on the cellular level? So the serum that turns a person into a Titan is regularly replenished by the body, meaning it never wears off.