Crowley Invasion of the British Commonwealth

The Crowley Invasion of the British Commonwealth is a global conflict which began on December 11th in the current year of the story timeline.

Following the attack on Aleister Crowley by Coronzon after his defeat by Kamijou Touma in the Windowless Building, the alternative possibilities which were bound to his body branched out and manifested across the world as the Crowley's Hazards - a disaster bearing Aleister Crowley's name. The billion-strong army subsequently began an attack on the 53 countries of the British Commonwealth, in response to Coronzon's actions and claims.

Aleister Crowley
On December 1st 1947, with his pursuers closing on him in the British countryside  and in accordance with the rules he had set when he had destroyed the Golden Dawn and cursed its members, Aleister Crowley turned his own blade on himself, and received the curse, collapsing like a burst bag. To most of the world, this was where he died. However, Aleister was actually saved by Heaven Canceller, who sewed him back together and sheltered him from the United Kingdom.

Afterwards, Aleister secretly came to Japan and took advantage of the situation to establish an institution in western Tokyo in the name of educational and technological recovery, creating Academy City. For the next sixty or so years, Aleister would operate from the shadows, working to bring his master plan to eliminate the phases and magic to fruition.

At some point during this time, Aleister brought over a billion of his alternative possibilities into the world, without having thought it through, and ended up having to bind all of these other selves to his body, with his life-support system being used to prevent them from diffusing.