Ruling the Apocalypse with More Children, More Blessings

(Invincible protagonist + unlimited supplies + multiple female leads)

He gets the More Children, More Blessings System. The more family members he takes in and the more descendants he has, the more resources he receives. Ordinary family members provide firearms, while family members with special abilities provide resources to improve those abilities. With a massive stockpile of resources, he becomes invincible.

In the early stages, he takes in large numbers of ordinary people to farm resources. Once invincible, in the middle and later stages, he starts taking in people of all kinds, including those with status and influence.