It is located on a desk amidst various boxes under the first stairway in the Female Ward.
"Brief introduction to WALRIDER mythology for M.R.D. Support Staff
The Murkoff Corp.
NOTE - this is for support/notational purposes only, engage in NO direct contact with patients during or after therapy.
The WALRIDER, also known as an "Alp," or "Mara," or "Schrat," is a demonic creature of German origin that torments sleepers. They crouch on a sleeper's chest and crush the breath from him. The sleeper wakes terrified, paralyzed, and asphyxiating. The name "Mara" gives us the word "nightmare." Sexual assaults by the demon are rare, but it has been known to drink the milk from breasts of sleeping women, and blood from the nipples of sleeping men."