War System: I Become a Warlord in the Apocalypse

[Troop-summoning + System + no wanton killing + farming and development + nation-building + factional rivalry] (The protagonist doesn't like killing indiscriminately.) Like the protagonists of so many novels, Jiang Yun has no car, no house, and both parents are dead. After losing his mother, he finally awakens the War System! The main conflict is the struggle for supremacy, with the central story revolving around wars between two factions. These may be wars between humans, against mutated beasts, or against zombies. Later on, the zombies will develop intelligence. The goal is to write a story about unifying the world.