The temple library key is a quest item obtained during the In Aid of the Myreque quest. It is used to access a secret room under the Mausoleum of the Paterdomus, the Temple of Saradomin on the River Salve. Drezel has the key and is located in room containing the secret trapdoor to the library.
This key cannot be put on the Steel key ring acquired from completion of One Small Favour. Once the trapdoor is unlocked, however, it remains unlocked, so there is no need to keep the key afterwards.
- The key's description used to include "In Search of the Myreque" instead of the correct "In Aid of the Myreque." This was fixed in a later patch.