MTL - Armageddon: Shelters Can Be Upgraded Infinitely

<p>The world is changing, natural disasters are coming, and the whole people will travel through the doomsday game!</p> <p>Scary beasts, wild swamps, weird ruins, dangers are everywhere!</p> <p>Human beings can only rely on shelters to survive and accept rounds of natural disasters!</p> <p>- Description from <em>novelbuddy</em></p>