What is the treasure in Mariejois?

[SSJ2]

Doflamingo implies that if he had the Ope Ope no mi, he'd have been able to use the treasure which can apparently "shake the world to its core". What could this possibly be?

 

[Warmmedown]

6 special shells. Get the seventh for a wish.

Maybe it's Roger? He could be put back together maybe? Or maybe a body part that he could take?

 

[Symbiote]

Uranus?

 

[Warmmedown]

Haha so funny. Why don't you just go the full mile and change your username to Comedy

Immature