The rock work amazes me just as well as the rest of this spectacular MOC. I like how you didn't you use a plain white background and instead you made it grey to give off a kind of creepy and scary feeling. 5/5 for sure!
Whether you invented the technique or not, that window looks great. So do the roof and the walls and the doorway and the deep-rooted chimney and the cornerstones made of 1x2 plates, especially at that diagonal to the rocks.