Citadel

"In the heart of this Forerunner structure, far above the troubled surface of the Ark, another battle rages."

- Bungie

Citadel is an upcoming Halo 3 map that will be shipped on September 22nd, 2009 with Halo 3: ODST, as a part of the Mythic Map Pack. The Shotgun Spree achievement is attainable on this map. The map is a section of the structure first seen in the Halo 3 Multiplayer map Epitaph, which is a Forerunner "cathedral" that towers over the Ark.

Achievements
This map has a Skull for the Multiplayer Achievements. When found, it unlocks the achievement Citadel Skull, which is depicted by the skull and a Forerunner glyph on the forehead. Another achievement for Citadel is Pull, given to the player for getting a shotgun spree on the map, worth an overall 25 Gamerscore.

Trivia

 * It has been confirmed this map takes place in the same tower-like Forerunner structure as Epitaph.
 * The map was first designed to be much bigger and originally had an elevator for each team, though these features have been removed for undisclosed reasons.