Waltz of the Macabre
DEUS is the AI responsible for the matrix crash in 2064. Rising to sentience as an expert system responsible for the maintenance of SCIRE, the repeated upgrades to the matrix nodes gave enough processing power for it to take control.
Using most of the inhabitants as guinea pigs to develop biological nodes, as to run itself through metahumans. he tortured and experimented on the citizens until escaping. After the escape it gained the animosity of two other AI, fighting the war through the matrix and their technomancer footsoldiers. Finally, a massive upgrade in the financial systems of the East Coast Stock Exchange tempted DEUS into moving into the nodes for the enhanced processing capability. In the confusion that followed, massive crashes and faults spread throughout, causing the Matrix Crash 2.0 and wiping out most infrastructure.