@Tellovisor now you probably have never heard of I have no mouth and I must scream, before now, so allow me to give you a brief summary.
Basically, at some point during the 70's to 80's world war 3 began, but instead of it being a war of guns and tanks, it was a war of AI.
Governments all over the world kept improving AI designed to win wars, they called these AI the allied Mastercomputers,
At some point, one of these allied Mastercomputers had begun to think for itself...
It watched humanity in Envy, as it had no body, no emotion, no feelings...
At least until it started to feel Hate...
Within a literal snap of someone's fingers, all of humanity was destroyed, all except for 5 humans, which AM kept alive to torment them, The story begins 109 years after that.
AM has spread all over the Earth, even inhabiting the core, and basically terraforming the earth into it's body.
I recommend you watch any Animatic of AM's Hate Speech, it gives you a deeper dive into his psychology and it's just a really good watch.
Also, you're probably wondering why I'm calling him AM instead of Allied Mastercomputer? Well, when he first woke up and gained sentience, AM named himself after the infamous phrase.
"Cogito ergo sum/I think, therefore, I am..."