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. The Shotgun Spree achievement is attainable on this map. It is possible that this map is located in a Forerunner Citadel, similar to the one seen on The Covenant.

Achievements
This map has a Skull for the Multi-player Achievements. When found it unlocks the achievement Citadel Skull. It has an image on the skull that resembles a Forerunner glyph. Another achievement for citadel is Pull, an achievement on Citadel given to the player for getting a shotgun spree, pull is worth 25 Gamerscore.

Trivia

 * It has been confirmed this map takes place in the same Forerunner structure as Epitaph.
 * The map was originally much bigger and had an evelator for each team.
 * According to Justin Hayward, the art director for Citadel, "It is a small section of the Forerunner structure that players first saw in the Halo 3 multiplayer map Epitaph."