Specimen 8 is a hostile enemy encountered in Spooky's Jump Scare Mansion. It is first encountered after a sequence involving unusually violent deer, which it appears to view as its children.

Specimen 8 is a floating, demonic, deer-like figure wearing a long black cloak. Its antlers are long, somewhat symmetrical, short, sharp, and spider-like, lacking the beam-and-tine structure typical of most deer. Specimen 8 has two eyes with white pupils and black sclera and lacks a lower jaw. It also has abnormally sharp and jagged teeth jutting down from the top jaw.

The cloak is sleeveless and even when open, reveals no limbs, as Specimen 8's body is comprised of a set of human rib bones, underneath which lies a host of screaming faces disappearing into the darkness.

Specimen 8 is inspired by the Beast from Over The Garden Wall, though it looks similar to the Kyrkogrim of English folklore, and the Wendigo from American Aboriginal folklore.