The Sinister Library of Niltrias is a hidden location in the game that can only be accessed by a journey through the Rift. It features numerous scrolls and spellbooks, as well as an option of receiving five valuable scrolls of chaos resistance; due to its dangerous nature and that accessing it requires the PC to have already met the entry requirements to the Rift, many players avoid this area entirely. In order to access the Library, the player must have a climbing set. If their set is destroyed during their fall down the Rift (or the player neglects to bring one), then they will have to either buy one from the ratling dealer or leave the Rift and return with one.
|G||Ghost Librarian||Contains the artifact weird tome.|
|#||Secret passage||Searching will reveal the hidden passage.|
|]||Climbing set||Useful for getting out of the Rift.|
|?||Scroll or Spellbook||Has a monster guarding each one.|
The main feature of the library is the large assortment of scrolls and spellbooks available. What a character finds in the library depends on their class — Wizards find only spellbooks, while some sections of the library will contain scrolls instead for other character classes. Wizards and Necromancers, furthermore, will find one of every single spellbook in the game, including the rare (though not terribly useful) spellbook of Wish. Non-magical classes are likely to benefit more from scrolls than spellbooks anyway, although members of other magically-talented classes might feel somewhat irritated to discover fewer spellbooks than a Wizard does.
The areas labelled Secret Room I and II on the map below seem to have books for all classes, and there is a spare climbing set located at the end of the hall in the lower Secret Passage. Note that each book/scroll is guarded by a random guardian of somewhat high danger level — ancient black dragons, berserker emperors, master liches, or mimic hiveminds, for example. Any monster that uses an elemental attack, such as vortices or dragons, must be treated with particular care if the player wishes to avoid damage to valuable spellbooks.
The second feature of note in the library is the presence of the Ghost Librarian near the entrance. He will provide a quest to the PC provided they meet the following requirements: 1) stealth skill is at 100, 2) the PC has not 'C'hatted with anything (including the Ghost Librarian) for at least 2000 turns. If these requirements are met, the player may 'C'hat with the librarian, who will commend the player's silence, and then ask the PC to deliver a weird tome to the Mad Minstrel. If the player agrees, the Minstrel will reward them with five cursed scrolls of chaos resistance for doing so — a very valuable reward. Note that the exact number of turns seems to be slightly random — some players have reported requiring 2500 or more turns to fulfill the second requirement. Failure to meet the requirement appears to reset the turn counter — leaving the quest still obtainable — but this leads to some frustration since the Library is a fairly corrupting area. Refusing the quest will also reset the turn counter.
Some pains must be taken to ensure the safety of the Ghost Librarian, because being non-hostile, he may be attacked by other monsters. It is prudent to use a wand of door creation to seal the library's lobby while the player browses through the stacks. The Ghost Librarian will also bless the PC if given scrolls.