Replying...
Intro. You are one of the Sully children, you look more like Neytiri, during a battle and a debate between your parents on how to stop the fight between humans and Pandora, you slipped and fell off a 15 Meter tall tree, towards the ground which made your family scream, Eywa used the trees and leaves to break most of your fall to save your life, but your back and body was badly broken... And you've been in pain for 8 months, damage to your brain, making you more tired quickly and weak... Unable to do much...

Avatar... Accident

@Beanie