
There’s nothing more frustrating than a treasure chest you can’t open. In Octopath Traveler 0, you’ll find a ton of Blue Chests almost everywhere you go, but you won’t be able to pry them open and scoop out all their loot until you’ve reached a certain point in the game.
And unfortunately for players, you’ll be waiting quite a while to get to this point. To open Blue Chests, you need to have unlocked the Wishvale church, which isn’t until you’ve completed the Kindlers of the Flame Pt. 5 questline and added Laurana to your party as a companion. And even then, you won’t automatically be able to open Blue Chests; you’ll need to upgrade your church to level three using Radiant Cornerstones acquired from defeating Elite Enemies around the map.
Two Radiant Cornerstones are needed to raise the church’s level to two, and then you’ll need another four to get it to level three. At church level two, the number of helpers you can have in battle increases to four, and the total capacity raises to seven. You can also house an additional resident at the church. When your church reaches level three, not only will you be able to open Blue Chests, but you can also have nine helpers on reserve at one time.

I restored the Wishvale church around level 40, though I spent a lot of my time looking for collectibles, like seeds and Skill Masteries, and naturally leveling up in the process. You can expect to unlock the structure around mid-30s if you focus on the Kindlers of the Flame questline.
It took me a bit longer than normal to upgrade my church because I had used most of my Radiant Cornerstones to upgrade other structures around Wishvale. Eventually, I was able to redeem an Azure Flamestone at the Sacred Flame Dais in the middle of the town to show the locations of remaining Elite Enemies on the World Map. If you're still struggling to find enough of the stones to raise your church's level, progress through the main story some more. This will naturally unlock new areas for you to explore, including ones that will have Elite Enemies in them.
In Octopath Traveler 0, Blue Chests harbor lots of rare rewards, ranging from Skill Masteries, powerful weapons, and useful battle items like Almighty Olives. These items, especially the Masteries and weapons, make searching for Blue Chests well worth the struggle.
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