just started reading the story, but you gotta make things more in line with cannon. for example , quote : "AVADA KEDAVRA!" yelled another Death Eater but Harry managed to throw himself on the ground and the spell sliced a tree in half crudely. Harry pulled his wand out and quickly used an unlocking charm to open the shack he was heading to. After stepping inside, Harry stepped inside, sealing the door shut before putting up a light anti-Apparition Ward that would only hold the Death Eaters for a few moments.
Avada Kedavra does not physically splice things or people.Unless they do in your story, it doesent even leave a scratch on the body. Kinda hard to imagine it splicing an entire tree.