Muscle, Tendon
This bamboo absorbed the moon's power, and you want that power in your body, so you surgically insert them into your body to replace your muscles and tendons.
Picture your new bamboo muscles glowing under your skin with the moon's power. You flex and feel the power coursing through you!
きん
すじ
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Your special muscles and tendons have become famous and the King (きん) of England has requested that you appear in his court! It looks like he wants you to teach his barber surgeons how you got your new muscles.
Imagine standing before the King, explaining in detail how you cut yourself open and replaced your weak human meat with the special muscles you have now. He's staring intently at you, but more so at your shining body than your mouth as you talk.