People have been speculating about this for a long time, but I think we finally have evidence thanks to Oden’s flashback.
![](https://www.opfanpage.com/wp-content/uploads/2020/02/000000-1.png)
Oden traveled to Laugh Tale and learnt the truth behind many things, such as the Ancient Weapons, Joy Boy, Wano and his own family.
![](https://www.opfanpage.com/wp-content/uploads/2020/02/bd2.png)
He discovered that Kozukis closed Wano off from the rest of the world to protect it from a great power – most likely Im and the World Government – and that it had to be reopened when Joy Boy returns so he could receive Wano’s help in the great war.
![](https://www.opfanpage.com/wp-content/uploads/2020/02/000000-2.png)
This implies there’s something special about Wano itself. Even Sengoku suggested it shortly before Oden’s flashback.
![](https://www.opfanpage.com/wp-content/uploads/2020/02/sengok-1024x507.png)
Well, if something was hidden in Wano 800 years ago, something that had to be used in war, it would certainly be ancient and a weapon… maybe the Ancient Weapon Uranus, the only Ancient Weapon that’s unaccounted for so far?
*Theory by Zeta42