The toughest treasures in Octopath Traveler 0 are the Blue Chests and they require a special key for unlocking them. Restoring Wishvale and upgrading Aelfric Church to Level 3 will provide access to the Blue Chests. Follow this guide for directions on obtaining the key, unlocking the chests, and increasing your Helper Capacity. How to … Continue reading Open Blue Chests in Octopath Traveler 0