I have a theory of what's in the box that the Master of Masters was dragging. I think it might be the 13 pieces of darkness of the shattered χ-blade. The χ-blade shattered into 20 pieces: 13 of darkness and 7 of light. We know that it broke into 7 pieces of light in order to protect the hearts of the Seven Princesses of Heart, but we don't know exactly what that means. Especially considering the Seven Princesses of Heart weren't alive way back then. But maybe it means that the χ-blade shattered into 7 pieces of light which would then become the Seven Princess of Heart's hearts in the future?

 

Also, we were never told what happened to the 13 pieces of darkness.

 

If a heart of pure darkness and a heart of pure light clash, then the χ-blade is recreated, but it is unstable. In DDD, it is revealed that Xehanort plans on capturing the Seven Princesses again so that they can clash with the 13 Seekers of Darkness to recreate the χ-blade. But, how can this be? The 13 Seekers of Darkness don't have hearts of pure darkness, so how would them clashing with the pure-hearted princesses recreate the χ-blade? I think I might know the answer.

 

I believe that Xehanort wants to find that case that the Master of Masters has or maybe he already has it. If the 13 pieces of darkness from the shattered χ-blade are in that case, then Xehanort can take them and put them into each of the 13 Seekers of Darkness' hearts to turn them into hearts of pure darkness. Then, he can clash with the Princesses of Heart to recreate the χ-blade, but this time, a much more stable one. It'd actually pretty much be the original χ-blade because it'd be created from the original shattered pieces.

 

So yeah, what do you think of this theory? Anything I could add to it?

Edited January 21, 20187 yr by Elfdemon_

Not a bad theory. I have nothing to offer because your guess is avoid as mine and the series is entering uncharted territory.

I'd bet Benjamin that it's the MoM's heart. Really think about how heartless, and more especially, nobodies are created. The MoM fades away, he says so himself at the beginning. "I'm going to fade away," he says. He doesn't die. When the heart leaves the body, a heartless is born from the heart, consumed by the darkness. The body "fades away" and a nobody reappears somewhere else. But in order for a nobody to be created, a heartless must be created with it. It's all in the Ansem reports. So why didn't the MoM become a heartless and form a nobody? Thaaaaat's the whole purpose of the box. It's black, like the cloaks. And any KH fan worth his/her salt knows what the cloaks are for. The MoM used the box to protect his heart from the darkness, thus keeping himself from becoming a heartless. And since no heartless was created when his heart was removed, no nobody reappeared anywhere else when his body faded away. And what's inside that box is another key... THE key to resurrecting the MoM, which we will probably see in KH3.

Your theory is pretty solid, Elfdemon! It could very well be that the 13 shards of darkness that shattered from the X-Blade could indeed be the contents of the MoM's box!

This theory is amazing, even if Master Xehanort divided his heart into all of the other 12 seekers of darkness, they would never form a complete heart of darkness (because only Vanitas was the one with a complete heart of darkness) and only with the actual pieces of darkness they would acheive their ultimate goal the x-blade. I would definitely agree with such theory.