The Great Abandonment

On October 17, 2018, the Reapers attacked.

They did not attack the Bonesharks or Gasopods, but they did attack their food sources. However, the locals didn't notice until days later, and the Gasopods built a wall around their empire for protection, while the Bonesharks placed a beacon so they would not get lost.

They went searching for food, and the Bonesharks found it easily, while the Gasopods did not, as they were looking the the Crash Zone because Casey had poor navigation skills.