COG Story

An unknown calamity filled the land with poisonous gas.

We can no longer live there.
They had to leave to find higher places or to build taller buildings. We call it herb.
Exchange iron rods for oxygen capsules for life support.
You will need an Ironbar to get oxygen.
Taking the Ironbar from someone else's ship and turning it into an oxygen capsule is the only way to survive.

Survive and find the city of gods.

good luck.