What's the Name of That Book??? discussion

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Bloodsong
SOLVED: Children's/YA
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SOLVED. Y/A, fiction, Achilles heel themed story about a guy who was invincible except for a leaf shaped spot. [s]
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I recall it being sort of timeless/placeless - it was like a retelling of achilles that didn't really incorporate Greek myth/symbology aside from the "achilles heel" idea. The main character was coated in something that made his skin super strong except for one spot that a leaf covered. He came across a mysterious, troubled family that had a lot of power struggles and may have competed for his attention or affection.
I can't remember if it was all very vague and dream-like or if I was just quite young and didn't get what was going on! It was in the YA section of my library.
It was a physical, paperback book and was in English.
Thank you!! This is my first post so please let me know if I missed something!
Spoiler below
(view spoiler)[ the main character is ultimately betrayed by some or all of the family. I think they do something like shoot arrows/bullets into the part of him that is weak. I recall it being a bit grapic about how his skin was still impermeable so it does damage inside him but can't come out the other side. (hide spoiler)]