Libris Adeptus

From GURPSworld Wiki

A secret library for magicians and their guests, located in "Room 101" at 7051 Hollywood Boulevard. Only those with Magery 0 or Power Investiture, or guests accompanying them, may cross the threshold of Room 101, if they are able to get that far: the doormen are thought to be able to read auras, and will not unlock the entrance to Room 101 for just anyone.