Reincarnate as the King of Killers and Summon Killers from All Realms

[Alternate World + Reincarnation + System + Sword and Magic + Summoning] (No stallion, no harem) Xie Zhi, who had just transferred to the criminal police force after graduating from university, had an accident. By chance, his soul traveled to a ten-year-old child with the same name on a continent similar to medieval swords and magic. In the past eight years, he has experienced and seen that the other world is not as beautiful as he imagined. The king is tyrannical, the lords are inactive, the nobles are amassing wealth, bandits are rampant, the slave trade is rampant, the wine and meat of the wealthy families are stinky, and there are frozen bones on the road. Eight years later, Xie Zhi was bound to the Almighty Killer System on his eighteenth birthday. You can earn points by completing tasks, and the points can be used to summon killers, obtain equipment, and exchange for supplies. The system gradually encouraged him to become the king of killers, summon beautiful killers, exchange them for sniper rifles, and embark on a journey to conquer the world. Xie Zhi: "I am the man who wants to become the King of Killers!!" Gauss laser sniper rifle? Purchase! Nano tight defensive leather jacket? Purchase! Cannons imported from Italy? Purchase! Magical invisibility cloak? Purchase! … Killers with different styles help out. Is Xie Zhi afraid? Xie Zhi calmly looked at the girls behind him and chuckled: "Afraid? It doesn't exist. I am the man who wants to become the King of Killers!" Mrs. Joel: "Are you my master?" Elsa the Huntress: "I can only love you if I kill you." Teacher Bichi: "Ara ala, do you want to take a closer look?" … "King of Killers? I heard that you want to break away from the control of the empire? Do you take me, Lord Blue, seriously?" "I advise you to hand over your killer army obediently!" "Oh? Why would I care about a dead person?" Xie Zhi sneered. The blue lord is timid...