Villain
If there's a treasure chest, there's always a villain too. The villain is trying to get to the treasure chest before the hero of the story.
And the villain always gets to the treasure chest first, often via nefarious means. That villain is SO important when it comes to treasure chests.
きょう
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The villain beat you all the way to きょうと to get this particular treasure chest.
Arrrg! If only you had been closer to きょうと! Then you might have beaten this dastardly villain.