I made something inspired by the legends of living trees, the stories of the Hollow Tree with the Headless Knight and the animated scarecrows in Doctor Who Series 3. This sounds very Halloweeny. Here is the Wood Scarecrow!
Backstory: Once upon a time there was a scarecrow made of wood. Then it became animated by black magic and started attacking its village. A man tried to kill it with his axe. But it stayed stuck in the creature's immortal head, causing great pain. The Wood Scarecrow angrily killed everyone and went wandering in the dark forest, turning mad due to the endless pain of the axe stuck in its head and terifying everyone it meets with its baleful eyes and its chain arms.