Blue Star was home to several species and races, each holding advantages and disadvantages over the others while reigning over their respective lands known as Continents.
There were no restrictions for outsiders to enter the area of another Continent except for few, but travel between them was not very frequent due to the enormous distances between them.
This led to only huge ships belonging to stronger continents being able to travel long distances, or individuals with 〖ZENITH〗 Rank or above who held enough energy to cover such distances, even though they lost a significant amount of energy in the process.
A major part of Blue Star was under the control of a few races, among which humans were the third strongest, possessing different bloodlines that enabled them to stand toe-to-toe with other races like Dragons, Vampires, Dariants, etc.
1- Spires are sharp towers beside huge mansions.
2- Ether is not something which a human body can withstand in long run due to its vigorous nature but it is far purer and denser than mana, making it used in Battleships and weapons in this world ( of course that guy is an Exception here )