In any city, in any country, go to any mental institution or halfway house in you can get yourself to. When you reach the front desk, ask to visit someone who calls himself "The Holder of Forbidden Tongues". The worker should bow before you, and then give you an urn. Now walk into an empty place inside the institute, preferably an unused supply closet. There, where nobody is watching you, open the urn and look into it.
Raise your head again. You should find yourself on a wooden stairway that leads downwards into a corridor. Go down the stairs, as there is no turning back now. After a while, you will hear something that sounds like a chorus, sung by monks, speaking a foreign language. Immediately cover your ears with your hands. If you hear too many words, a hideous creature will haunt you for the rest of your mortal existence. As soon as you reach a door, the chorus should stop. If it doesn't, quickly turn around and shout "TACITE!"- This is the Latin Word for "Silence". Now the chorus should stop at last; if it doesn't, pray to every god you have ever heard of for a quick death, and hope they listen, for if they don't, the singing will grow louder and louder until it drives your soul insane.
Step through the door. Inside a person is waiting for you. A masked monk in a red cloak. He will greet you in Latin with "Salve!” Do not say anything and wait a few seconds until he puts on the light. There will be inscriptions on the walls, on the floor and on the furniture. The Monk will stand at the wall on the other end of the room and wait for your question. Don't try to read the words on the Walls. If you do, you will, within seconds, go insane. Walk to him and ask him only one question. "In which language were they talking?" That and nothing else. He will then hand you a book and disappear. Do not open the book. If you do, you will release horrible demons that will torture you for an eternity. After you got the book, turn around and there should be two urns on the table. One will take you back to the place you call home. The other one will drag your soul into pitch darkness.
It’s up to you if you pick the right one or not.
The Book is Object 549, or object 11 of the lost 2000. Do not dare to ever read it.