Dunno if this was ever mentioned before and I'm too lazy to search it. So, here it goes: According to Wikia: (http://onepiece.wikia.com/wiki/Ancient_Weapons) "The Ancient Weapons are three weapons capable of mass destruction, each taking a different form. They are known as Pluton, Poseidon, and Uranus, each named after a deity for their godly powers. The weapons are not limited only to inanimate objects, but consist of living beings as well." We know Poseidon, which is Shirahoshi. She now inherits the power of Neptune which is to talk and control (to some extent) giant sea kings. Pluton was mentioned to be a ship, which Franky and Robin knows. No information about Uranus, as of the moment. Now, one thing I noticed is that the Void century seems to be full of Giants (additionally, the Giant Straw Hat at the end of Chapter 906, [well its look like a giant anyway]). Shirahoshi, as well is giant size and something tells me Pluton is a huge ship. On the island of Zou, we met Zunesha, the ancient elephant tasked to walk and nothing else. His voice can only be heard by few people and he responds only (so far) to Momonosuke. His a bigger than a giant elephant that goes way up the sky. I'm starting to think that he might be, or somewhat related to Uranus (as well as Momo). Thoughts???