Integrate the overlord at the beginning and become stronger when killing the enemy

Xu Qianqiu crossed into a world where people and Demons coexist at the beginning, he became the great prince of a kingdom. Who ever thought that the kingdom was in danger of being invaded by demons and destroyed more than 40 cities, and the king asked him to lead troops to attack demons fortunately, the strongest enemy killing system is turned on, integrating the power of overlord since then, there has been a crazy killing God in the world "congratulations to the host for killing demons and obtaining Yanyun's 18 horses." "congratulations to the host for killing demons and obtaining the tiger roaring dragon chanting iron cloth shirt." "congratulations to the host for killing demons and obtaining the character card Li cunxiao."... Xu Qianqiu led his army to destroy the demon and recover the lost land. But just before he hit the demon's nest, the imperial court signed a peace agreement with the demon and ordered him to withdraw his troops Xu Qianqiu looks faintly at the direction of Wang Du. You know, he can not only kill demons, but also get system rewards... He can kill people!!