They are trying to repair a dead host that you have killed in the past of a murder drone by assimilation, tricking others to help assimilate into the murder-drones with holograms. They are a set of cameras stemming from a flesh-like core, controlling the dead drones, turning them into a horrifying snake-crab hybrid. They will manipulate you, trying to assimilate you for their program. They talk similar to GLaDOS.