Vast Wilderness
When the people of Lunar and Solar cities began arriving at Terra City borders, the guards immediately began to dispatch multiple groups to welcome them. They gathered the appropriate information that was needed about why so many people had suddenly fled their homes.
When they discovered that there were no longer homes for these people to go back to, it became an even larger issue. Multiple letters were sent out on the fastest beasts that Terra City had. They traveled to every other city to be able to tell them what was happening.
The battle against the blood moon cult was something that every city went up against. They all had to hold some part of the plan to be able to stand against this evil. There was a simple but clear reason for this. They had to stop the creations of monsters.