Chamber of Mazarbul
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The Chamber of Mazarbul was the old chamber of records of Khazad-dûm. Probably built during the earlier years of Khazad-dûm, it was later used as a base by Balin when he began his ill-fated attempt at recolonization in the late Third Age.
The chamber itself was probably built at around the same time as the Twenty-first Hall in the Seventh Level. This would have been slightly later than the earliest Dwarven delvings, which were to be found in the lower levels near the Great Gates.
When Balin was killed a few years later, he was laid to rest in a tomb inside the chamber. It was there where the last remnants of the colony perished.
It was in the Chamber of Mazarbul that the Fellowship engaged in a brief fight with a band of orcs and a Cave-troll. They retreated through the east door and Gandalf attempted to guard it against the Balrog. The roof of the Chamber collapsed then.
 Geography and appearance
The chamber was located to the right of a pathway that branched off the north end of the Twenty-first hall. When the Fellowship found the chamber as they passed through Moria, Balin's Tomb was located inside it, and a bright shaft of sunlight streamed in from outside the mountain to land directly on the tomb.
There were two stone doors leading into the chamber (one entrance from the Twenty-first Hall, one from the stair tunnels that the Fellowship later used to flee the Balrog). Many deep recesses were cut into the chamber rock containing chests that had been recently looted by the Orcs inhabiting Moria. A deep dust had fallen upon the entire room by the time the Fellowship entered it, and the remains of a long-abandoned battle site were to be seen strewn across the floor.
 Portrayal in adaptations
- In Peter Jackson's The Fellowship of the Ring (Scene 35: Balin's Tomb and Scene 36: The Bridge of Khazad-dûm), the Chamber of Mazarbul is presented much as it is described in the books, with a few notable exceptions.
- It is placed in the center of the Twenty-first Hall, rather than on the right of a corridor running off the hall to the north.
- There is only one proper door explicitly shown leading into the chamber, rather than the two described in the book. This door is also made of wood in the film, rather than stone. There is, however, one smashed doorway out of the back of the chamber, with the window illuminating Balin's tomb above it, which the Fellowship flee out of.
- A well is also introduced into the layout, directly below the shaft of light. This well was found in the guardroom of the Crossroads in the book, but was transplanted here to serve greater dramatic purpose.
2007: The Lord of the Rings Online:
- The Chamber of Mazarbul is the final stand in the battle for the Twenty-first Hall, one of the three battles where the Iron Garrison battle Orcs to drive them out of Khazad-dûm in Mines of Moria, Book V: Drums in the Deep.
 See also
- North End
- Seventh Level
- Twenty-first Hall
- Balin's Tomb
- Battle of the Chamber of Mazarbul
- Book of Mazarbul
- J.R.R. Tolkien, The Lord of the Rings, The Fellowship of the Ring, "A Journey in the Dark"
- J.R.R. Tolkien, The Lord of the Rings, The Fellowship of the Ring, "The Bridge of Khazad-dûm"
- The Lord of the Rings: The Fellowship of the Ring (extended edition) Audio Commentaries (Scene 35)
- Gary Russell's The Art of the Fellowship of the Ring: "Moria"
- Alan Lee's The Lord of the Rings Sketchbook: "Moria"
- Fellowship of the Word-smiths: Other Movie Inscriptions - A web page discussing many inscriptions from the movies, including those found on the Mazarbul walls.
- Mazarbul Wall Inscriptions Analysis - A web site discussing the transcription of the Mazarbul wall runes from screen to page.
- Mazarbul Wall Rune Analysis (English Only) A detailed analysis of the English Mazarbul wall rune text.
- Mazarbul Wall Rune Incident A detailed analysis of the incident with comments from those involved.