Upgrading an Apocalypse Fortress into a Castle

Fusion + missions + upgrades + no-brainer fun: Build a world-class castle! Somewhere in the world, a ten-thousand-zhang rift splits open in the abyss. Viruses hidden within it spread out, infecting and mutating all humans and animals. Pick up a few beauties along the way. After being reborn and activating the System, use memories from a past life to build the most impregnable castle! 【Book One: Developing a Primitive Society】, Ongoing…