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Purple Reign is the nickname for a map that was announced in the Bungie Weekly Update: 10/26/2007. This map was originally planned to be in the Legendary Map Pack but will now be included in the following map pack later on. It has been stated that it will be symmetrical or semi-symmetrical with the middle of the map being higher than the rest. According to the Bungie Weekly Update: 1/4/2008 the map will be an entirely new map. The map is supposed to be full of mid to long range weapons, and from what the update states it appears there will be multiple floors. This map is based outdoors.

Bungie confirmed that this map does not reference Prince's song or the movie Purple Rain.

It was originally planned to be in the Legendary map pack but was replaced by "Blackout", (Moonlight Sonata) due to the fear that it was not going to be finished in time. This does not, however, mean that the map has been scrapped, only that it will appear in a later set.

Due to the name, possible origin, and structure of the level, some fans have speculated that this map will be set on a structure of Covenant origins, with the map possibly taking place on the ship similar to the Unyielding Hierophant or Pious Inquisitor, which has lead many to believe that Purple Reign could be a possible remake of Halo 2 multiplayer map Midship.