The Library Reserve Key is a key that is found in Silent Hill. It is located in the second floor locker room of the Otherworld Midwich Elementary School. After examining a rattling locker, Harry will discover that the locker is empty. As Harry then attempts to leave the room, a body will fall out of another locker, containing the library reserve key.
The key can be used to open the room marked "Library Reserve" on the second floor. The library reserve contains books for the school library. One such book is a fairy tale that serves as a guide to defeating the Split Head boss underneath the school.