Slaughtering four Demon World Cities and taking over all the civilian wealth immediately allows the Beamon to satisfy their arms purchases for a long time — rare goods are precious, not to mention the commonplace crystal utensils in the Demon World are enough to make the Tang Zang Empire, Dubin Kingdom, and Bonaparte Medusa drool!
This is using war to sustain war, the most fitting mode of warfare for Feilengcui style.
What slightly surprised Rommel was that Richard agreed to such an atrocious act of city massacre that would enrage both gods and men alike; he didn't even notify the Beamon King but instead led the Centaurs into the Demon World.
