The End of the World: I Have a Mobile Fortress

The apocalypse is coming again. In this life, Jiang Xunzhou awakened the mobile fortress system. He survived the apocalypse hard in the early stage. After passing the system assessment, he officially unlocked the system, hunted zombies of different levels, obtained the blue crystals in their bodies, upgraded the fortress, strengthened himself, killed monsters and upgraded, and rampaged through the apocalypse!