Infinitely Upgrade the Shelter, What the Hell Is the Cosmic Fortress?

The red moon is coming, and zombies, monsters, and demons are coming like a tide. Zhang Heng received a shelter that could be infinitely upgraded. [Consumption of 1288 kill points, the shelter is upgraded to Doomsday Lava Castle] The flaming red fortress is impregnable. Red magma spurted out, easily dissolving the zombies. Zhang Heng was hiding on the top floor of the lava castle, drinking red wine and watching comfortably. [Consumption of 2556 kill points, additional weapon anti-gravity annihilation cannon] Dark material spurted out from the muzzle and cut through the sky. The Demon Lord fell powerlessly from the sky. [Consume 12533 kill points and install a falling star defense array] … [Consumption of 2,778,901 kill points, the refuge was upgraded to the Holy Land of Cosmic Celestial Phenomenon]