The chamber of records of old Moria situated on the 7th level, near the 21 hall of the north end. In it were originally kept many chests containing inscribed stone tablets and ancient books of the dwarves. But following the flight from Moria by the dwarves- following after the coming of the Balrog in 1980 third age- the chamber was plundered by orcs. None of the original records survived at the time of the war of the ring. The chamber of Mazarbul was later used by Balin son of Fundin as a thrownroom after his expidition entered Moria (2189 third age). Following his death, the remnant of his colony fought to the last in this chamber, falling finally in defense of Balin's tomb. The fellowship of the ring fought in this chamber in attempt to escape Moria.
Figured I could ad this information on, and I made this way before the lotr sets were anounced.