"As far as I know, before the Great Destruction, the people who lived on this land built many large-scale Shelters and air-raid shelters to prepare for potential catastrophes.
It's said that back then, two of the most powerful factions in the world, the Eagle and the Bear, vied for supremacy. Later, the Bear Race fell into decline, and a new faction rose up on this land—they called themselves the Dragon Race, and they continued the struggle against the Eagle Race. They are our ancestors.
And although the Bear Race declined, they still created the powerful Northern Bear God, ranking in the top three in terms of combat strength.
Besides the Eagle, Dragon, and Bear, there were other factions of considerable strength, and all of them were drawn into the war of the Great Destruction.
Before the Dragon Race rose to power, they had already constructed some large Shelters and air-raid shelters to defend against invasions from the northern Bear Race.
