User blog comment:Kaido King of the Beasts/Why Does Doflamingo Carry a Gun? - And Other Stupid Questions/@comment-4374114-20141124214422

The main question I have through the course of this arc is how the world seemed to have lost the memory of the Void Century. The dwarves seem to have quite a bit of knowledge of the life prior and that of life immediately after but not of the time of the Void Century. Could there be a DF out there that has the ability to wipe out memories? Could it have been used at a global scale? Maybe the 20 kings had this DF user and had to go place to place wiping memories, as the same time those that made the Poneglyphs had to stay on the move, which is why they are spread all over. And for those that say once the DF user died the memories would go back, but with the Ope-Ope fruit the user could have been given eternal life.