I think the golden chest is to lose the tutorial battle at the start of the game!
I'm afraid I can't remember the other two chests just by their position... could you share the unlock hints, and then I can help you further.
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hi thanks for answering,
the purple one says'' you find yourself entering a western path... and pestering a newcomer and his tent. Suddenly your corruption flares up...''
and the blue one : you leave the bandit hideout with a souvenir in toe... you decide to leave this with another, until they have the necessary tools and amount to repair it.''
your game is great by the way
Thanks for the compliment! Glad you enjoy it enough to want to 100% it!
Purple chest: With 10 Corruption, try and repeatedly enter the Mercenary Commander's tent over to the left / west of the inn (hooded guy who gives you desert robes).
You can grind Corruption points if you want by getting repeatedly captured by the jungle slugs or the green slime dragons.
Blue chest: You need to give the 'slave suit tatters' to the blacksmith and let him make a new set of armour for you. This item can be acquired by getting captured by the bandits and then escaping... and there'll be a new way to acquire it in the upcoming update.
Up to you if you want to replay the game, or wait for the new update.
Hope this all helps!