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Purple Reign is the nickname for a map that is announced in the Bungie Weekly Update: 10/26/2007. This map will no longer be available in the Legendary Map Pack but will be included in the following map pack. 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 and movie Purple Rain.

In a recent Bungie Weekly Update, it has been stated that this map has been delayed and will not feature in the next DLC, but will be replaced by "Blackout", (Moonlight Sonata). This does not, however, mean that the map has been scrapped, only that it will appear in a later set.

Due to the name, some fans have speculated that this map will be set on a structure of covenant origins.