6666 A.D, the worse year to be alive.
In the middle of the giant chaos; huge volcanoes erupts a lot, tsunamis happen so much, earthquakes are common, everyone fights and kills for basic needs like food and water, there happens to be only one tower to save you: "Mega tower of secureness", but in order to get into this ginormous tower, you have to survive through all the chaos, and hell.
From your old, large house, you see buildings on fire, tsunamis everywhere, every large volcano nearby erupts, dead bodies are on the streets. Prices were high, your chance of surviving from going to your house to the "mega tower of secureness" was almost absolute 0. The tower stands mighty, great and gigantic. You can either stay in your house and suffer with everyone else or risk it all and try fighting and going to the mega tower to be saved.