Disc
Jade Disc
You offer a hot pepper to the king, and he gives you a drop of something. You look down at the drop to see it transforming into a disc. And not just any old disc at that. It's a jade disc.
Have you ever seen ancient Chinese jade discs with holes in the middle? That's what this kanji is referring to.
へき
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You look closely at the disc and realize the hole in the middle is actually a keyhole. You fashion a key out of hay — a hay key (へき) — and shove it in. You rotate the hay key until you hear a click. The jade disc opens.
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