Citadel

Citadel is an upcoming Halo 3 map that will be shipped in Fall 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, indicating that it may take place on Forerunner terrain or, given the Covenant's use of Forerunner glyphs, is Covenant in aesthetics. Another achievement for citadel is Pull, an achievement on Citadel given to the player for getting a shotgun spree, pull is worth 25 gs.