Water Seven: Near the end of Chapter 4, Zoner can be found near the fountain at the base of the stairs near the Mayoral Residence.Alabasta: Zoner first appears in the oasis at a camp located near the top of the Great Sandy Desert.To get you started on the Grand Line Quiz questline, here’s where Zoner can be found in each section of Memoria:

Until then, you will have to remember where the locked treasure chests are located (or you can just use this handy guide, yeah?). Only after completing Chapter 8 will Zoner at last appear as a blue-marked side objective in Dressrosa. That said, you need to find Zoner in four areas - Alabasta, Water Seven, Marineford, and Dressrosa - meaning that you won’t be able to get the Treasure Key until after Chapter 8, which is near the end of the game. Luckily, you don’t have to worry if you get the multiple-choice questions wrong, since you can immediately restart a quiz without any penalties. The Treasure Key is a reward for completing a chain of four Grand Line Quiz side quests involving the pink-haired Zoner, a character who will test you on various facts about One Piece lore. How to get the Treasure Key for locked treasure chests Dressrosa Locked Treasure Chest locations (4 chests).Marineford Locked Treasure Chest locations (1 chest).Water Seven Locked Treasure Chest locations (5 chests).Alabasta Locked Treasure Chest locations (4 chests).Waford Locked Treasure Chest locations (8 chests).So I went back and scoured Waford and Memoria for 12 hours until I finally found the answer. That’s a bit surprising considering that you need to open every locked treasure chest for the “Treasure Hunter” Achievement or Trophy.

I actually finished the game without getting the key at all, and not once was there a hint on how to get the Treasure Key. I originally thought that the Treasure Key would appear at some point through the natural progression of the story, perhaps by having one of the Straw Hat Pirates like Usopp remembering how to craft a key. But you won’t be able to open it for a long time. You’ll likely see your first locked treasure chest, which are brighter and have a golden trim compared to the typical chest, on the main island of Waford in the first or second chapter of the game. Locked treasure chests are peppered throughout One Piece Odyssey, but the method of unlocking them is actually quite obscure.

Treasure chest key one piece odyssey