Headless Horseman

On a cold October evening as the sun vanishes, you wander by a large oak tree. Despite the other trees around it being full of orange leaves, this one is dead. You can't explain, but the tree calls to you. You step closer to see the tree, as you do so a gallop echos in the distance, getting closer. Before you know what's happening, a large black steed firmly stops in front of you. A man is atop it, there is a green flame where his head should be. "What brings you to my land?" His voice echos.