The Holy City is rather special; living inside means not having to worry about Snake Spirits mutating and becoming deformed.
All the low-class individuals on the Snake Spirit Continent, that is, normal humans who haven't been blessed by the Snake God, long to live and settle here.
But due to limitations in territory and resources, the number of humans that can survive within the city is limited.
Over time, those who couldn't enter the city could only gather outside the Holy City, waiting for an opening, gradually forming what is now the settlement town.
Where there are people, there are conflicts and divisions of interest.
The Holy City's interior also prefers to have ordinary people serve them, helping with farming, hunting, harvest, patrolling, and so forth.
Hence, within this settlement town, the appearance of the Three Great Armies.
Falcon, Thorns, Earth Rock.