The Four Great Empire are the powers which rule over the Azure Continent, in which Dana has reincarnated within.
Each of the four great Empires strongest experts are their respective Emperors, each being a ninth rank Houtian however some of the Empires are naturally stronger than the others.
The Holy Empire is the strongest of the four, mainly because of the influence of the church as there are many patriotic believers in the church across all four great empires, so therefore they have the most substantial influence and amount of experts. However, even though they are the strongest, with having Six Houtian experts including the Pope of the Holy Empire which is a 9th Ranked Houtian they are still wary of the other Empires as if they engaged in a full-on war then, the other Empires when threatened will likely create an alliance to oppose their Empire causing them significant causalities!
The Azure Empire is the second strongest due to Devils Peak, as it is the largest habitat of Spirit beasts among the four continents, as they tax cultivators which come primarily to hunt spirit beasts in the forest they have gathered a vast amount of wealth, thus creating a large number of experts. Although not comparable to the Holy Empire, they still possess considerable power of their own! Previously they had Lord Evergreen, who even had equivalent battle power to each of the strongest experts of each continent, however, he later died in an ambush by the Eranyth Empire and fell against the three strongest experts of Eranyth Empire as a result of their combined attacks, and being injured due to a sneak attack.
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Thus, at the moment they have four Houtian Cultivators.
Eranyth Empire is the third strongest between the four great empires, and they are slightly weaker then the Azure Empire, the only reason they can be slightly weaker even with the Azure Empire obtaining the advantage of owning Devils Peak, is that they have a large amount of the best alchemists in the Azure Continent. With the use of this alchemists, they create many of the top pills which the four continents buy in mass, providing them with a large amount of wealth.
As a result of this wealth, the Eranyth Empire has raised a large number of strong cultivators and has three Houtian Ranked cultivators.
The last and weakest Empire is the Orthos Empire, although the weakest they are by no means an Empire which can easily be trampled on. They have two Houtian Ranked Cultivators.
The reason why other Empires are afraid to invade Orthos Empire is if the Orthos Emperor disregards his life he can deal a severe amount of damage towards the opposing Empire, thus weakening their forces by a significant amount.
Therefore, this will cause another Empire to take advantage and wipe them out something which no Empire believes is enough of a risk to invade Orthos Empire.