Most people would think AGI will develop some fancy tech to kill human, an engineered pathogen or nanobot, but in fact, how human domain some area, then agi can use the same way to do it. Like recruit followers, invade some area and ask people to service to it like the human ruler do. In fact, I think develop fancy science tool is the most hard to get rid of human control, and recruit some human to beat and control the other human is a more funny and feasible plot.