I'm reminded of the Reptites from Chrono Trigger. They ruled the planet when humans were still primitive; the arrival of Lavos wiped them out and allowed humans

I'm reminded of the Reptites from Chrono Trigger. They ruled the planet when humans were still primitive; the arrival of Lavos wiped them out and allowed humans to flourish. But as it turns out, Lavos was "farming" humans as food for itself and its children...