Type-Moon: This Magical Failure of Mine Can Take on Heroic Spirits One-on-One

I awaken mastery over the Four Calamities, and every fly is mine to command. Drink blood to gain magic resistance, absorb water to gain holy light, devour all things, and evolve without limits. Servants? Masters? They’re nothing but food for the Four Calamities under my command. How many Four Calamities are there in this city? The answer: hundreds of millions. And every last one of them obeys me.