Harry Potter and the Forest Quest

It was a bright Saturday morning at Hogwarts School of Witchcraft and Wizardry. Harry, Ron and Hermione had a special task; to get to a rare bark called Moonshade Bark, which could only be found deep in the Forbidden Forest. They packed some things. As they stepped into the forest, the strange sounds echoed from deeper inside. The trio spent the centaur clearing and the rocky hill. They spotted the magic creatures, small glowing fairies, a family of browtruckles, and even a sleeping troll of in the distance. Soon, they reached the Moonshade trees. Harry carefully cut a piece from one tree whit a small, enchanted knife, and wrapped it in cloth. Suddenly, Lumawolf stepped out of the shadows. It had the body of a large wolf, its fur glowed faintly green and its eyes looked intelligent. The Lumawolf are guardians of magical trees and specially one like Moonshade.
Harry carefully took a step forward and held out the bark he had collected, showing it to the wolf. Hermione cast a healing charm, so the tree doesn´t suffer. The wolf slowly walked into the trees, disappearing as silently as it had appeared. Back at the castle, they gave McGonagall the bark. that night, Harry lay awake, staring at the ceiling. The imagine the Lumawolf wouldn´t leave his mind. In fact, he even dreamt of the Lumawolf. The next day, he brought it up at breakfast. Hermione explained to them that they´re extremely rare and deeply magical and communicate thought dreams. Harry said, it tried to tell us something. They decided to return after they were done with their breakfast, this time better prepared. When they entered the forest again, everything seemed more familiar. Suddenly, the Lumawolf appeared whit another small wolf. The original wolf touched its nose to Harry´s forehead. Harry´s mind filled with flashes- imagines of dark shadows spreading in the forest, something poisoning the land, creatures fleeing deeper into the woods. They ran back to the castle. The trio talked with McGonagall. whiten an hour, the group assembled at the edge the Forbidden Forest. After, the group entered the forest cautiously, wands drawn. Suddenly, the two Lummawolves stepped out the shadows, the group followed. At last, they entered a clearing, at its center loomed a twisted black tree. "A Cursed Yew", Professor Sprout said grimly. They´re rare trees infected by Dark magic. They feed off life energy-plants, animals, even wizards. The one responsible was a Death Eater and servant of the Dark Lord´s old magic, Morgrath. He used the forest as an experiment. So, they needed to destroy the tree, so that his magic would weaken. At last, they set the tree on fire, and it collapsed in a burst of ash. Morgrath screamed as he was thrown backward, his wand flying from his hand. Before he could recover, the Lumawolves leapt, and they dragged him into the shadows. Everything had finished; the forest would heal now. Maybe year but it´ll come back.

I wrote this for 3 hours; I would really appreciate your corrections.