We stand at the dawn of a new security paradigm where autonomous systems on both sides of the battlefield are changing the dynamics of attack and defense. Drawing on recent Google Threat Intelligence findings, this session reveals how nation-state actors and cybercriminals are already weaponizing AI while showcasing how defensive AI agents can create self-improving security systems. Learn how the constraints of cost, latency, and efficacy are shaping this machine-vs-machine future, and discover how autonomous agents and domain-specific languages enable a continuous feedback loop to rapidly strengthen defenses.