1. The One Piece contains all the technology necessary to recreate the Ancient Kingdom's material things.
2. The Will of D is based on the beliefs and values of the Ancient King of the Ancient Kingdom. This is the immaterial thing that can't be passed on by using the One Piece.
By using these two things, it is possible to not only recreate the Ancient Kingdom, but also to provide it with a new king.
The One Piece was designed this way to allow the Ancient Kingdom to be recreated repeatedly. In other words, it can be destroyed, and recreated infinitely, and this is how it can be regarded as an eternal kingdom.
The One Piece, in this respect, does the opposite of what the Ancient Weapons do. The Ancient Weapons create extinction events, but the One Piece allows people to survive extinction events.
2. The Will of D is based on the beliefs and values of the Ancient King of the Ancient Kingdom. This is the immaterial thing that can't be passed on by using the One Piece.
By using these two things, it is possible to not only recreate the Ancient Kingdom, but also to provide it with a new king.
The One Piece was designed this way to allow the Ancient Kingdom to be recreated repeatedly. In other words, it can be destroyed, and recreated infinitely, and this is how it can be regarded as an eternal kingdom.
The One Piece, in this respect, does the opposite of what the Ancient Weapons do. The Ancient Weapons create extinction events, but the One Piece allows people to survive extinction events.