WN/Sovereign Alliance of the Nasca Namrium Ulmeria Empire

The Eastern Empire is large military nation that is known as the strongest nation in the entire world.

Background
The Eastern Empire was a military nation that increased in size by absorbing its weaker neighbors. It invaded when it wanted and trampled down anyone in its wake. So it also made full use of spies.

“Death to those who disobey!” This was the principle they live by, so if the targeted state didn't swear allegiance within a week, they immediately invaded. Their sphere of influence failed to extend into the Jura Forest, though there had been victims among nearby states that had fallen to the Empire. The country itself is filled with people with various skills and knowledge. The Empire also welcomed world travelers with open arms, and most of their influence changed the empire.

There were two individuals with absolute power that have authority over the rest: The Emperor himself and the Generalissimo. There were also others who were the de facto commanders that had control over the armed forces of the Empire. They were powerful enough to surpass the demon lords' standard level, and had ensured the Empire's safety for hundreds of years. These de facto commanders were positioned as the three Generals. These three commanded each of the three Corps of the Empire's armies. The Generalissmo and the Generals, these four men were the pillars of the Empire. Each had been given the Empire’s treasured God-tiered equipments - equipments of unbelievable power/the strongest equipment before which no man can be an equal to. The Generalissimo  himself and the de facto commanders also had the duty to protect the Emperor with the Guardsmen - the Emperor's personal guards/ The Royal Knights.

The Royal Knights: A hundred individuals of great power joined the Royal Knight Corps; their strength was legendary. Of course, many of them were from another world. The Empire did not discriminate against world travelers, and recognized only strength. To these one hundred, the Emperor bestowed legendary equipment. These one hundred are the Empire’s strongest force.

Chronology
Empire’s Invasion Arc

940,000 men from the Armored Coprs were completely annihilated by the Monster Country Tempest, which were invaded by the Empire. and had their souls reaped by Rimuru Tempest, the King of Tempest.

However, The Demon Lord Rimuru revived 740,000 among them for Tempest's laboured servitude and put curses on them so that they wouldn't be able to oppose Tempest ever again. These left 200,000 souls that were completely destroyed during the war and, thus, were the only "real" casualties of the first battle between the Empire and Tempest.

Ryuma Clash Arc

90,000 men comprised of the Beast Corps and the remaining Armored Corps, which included 30,000 Magic Beasts, 30,000 Magic Beast Riders and 30,000 Mages, were completely annihilated by Demon Lord Rimuru and the Black Corps/Numbers of Tempest upon invoking the Demon Lord's wrath by taking control of Storm Dragon Veldora, who's Rimuru's friend.

10 Strongest Royal Knights also fell victims to the Black Corps in the battle.

Only Vega (Yuuki's spy for observing the Magic Beast Corps), the Emperor Rudra and Scorch Dragon Velgrynd survived the battle.

Among the 300 Airships in this battle, 200 were salvaged for Tempest under Diablo's order.

Kagurazaka Yuuki Killed Rudra, Stole Ultimate Skill Justice King Michael and Invoke Armageddon and summon 1 Million B+ Rank non Sentient Angel causing 1 Million from 3 Million civilian at the Eastern Empire Capital Killed.

Kagurazaka Yuuki Revive Vega and Kagari (Kazaream).

Tenma Great War Arc

During the Walpurgis Banquet, The Eastern Empire was granted by Eight Star Demon Lords as Rimuru's New Territory to the Demon Lord.

Principles
The Empire is found upon the maxim that strength is everything.

Through inter-army duel and combat, a system where the young may usurp the seat of the elder was established. Though forbidden during Army's marches, any members of the army could challenge a superior to a duel if they believed they can surpass their superior. If they were defeated, they would have to wait a year before they were permitted to challenge the superior again. As such, everyone continuously sharpened their skills.The best system for a country where strength is everything. In addition to the position of a captain or a general, there's also the position of The Emperor's personal Guardsmen / Royal Knights that held great influence and power within the Empire. These positions were always filled with powerful individuals who can not be easily defeated within the Empire. As a result, if you wanted to rise in status, you would wait for an opportunity to defeat them.

The Empire increased its influence by absorbing weaker nations and invading nation that did not submit. With this principle, If the targeted country did not swear allegiance within a certain time, they would be immediately invaded by the Empire.

Military Strength
The Eastern Empire was known as being the strongest military state in the world.

It's implied that the author use the same Rank system for Officer like the Rikujo Jietai (Japan Ground Self Defense Force). World Travelers are given preferential treatment, even at the lowest they will receive treatment as Second Lieutenant.
 * General (Corps Commander)
 * Lieutenant General
 * Major General
 * Colonel
 * Lieutenant Colonel
 * Major
 * Captain
 * First Lieutenant
 * Second Lieutenant
 * Warrant Officer

Empire’s military is split into three divisions/corps:

The Armored Corps: A Marvel of Technology by Imperial Engineers.
They rode Modern Tanks and symbolized the Empire’s technological prowess. The Armored corps, where science and technology of the different world were fused as magic technology, is the largest Corps with the largest number of soldiers that could be mobilized exceeded 2 million. In reality, however, the number of soldiers who could participate immediately in military deployments was 1 million  The remaining were on standby in various places within the Empire. Even so, the scale of the corps could be considered abnormal.

The Armored Corps that could participate in the military deployment consist of:

1. Armored Remodeled Legion-Legion of soldiers who received Magic Remodeling by magic and technology of the different world. The individual ability increases and has ability considerable to B - A ranks. Even at the lowest of the corps, the soldiers could still be considered to be stronger than C+ rank. Number of soldiers affiliated: 700,000 people.

2. Magic Tank Division-Magic Tank 4.000 units. Number of soldiers affiliated, 200.000 people. The Empire’s secret weapon, each Magic Tank were piloted by 5 people. The main armament of each Magic Tank was Magic cannon optimized by other world’s technology, the cannon was used by amplifying magic and firing it.

3. Aerial Fighter Legion-Airship 400 aircrafts. Number of soldiers affiliated, 100.000 people. One aircraft can be boarded up to 400 people. Operating one aircraft needs about 50 staff. The other personnel is to be engaged in bombardment. It’s also useful as transportation for large scale military deployment. Since it could be said that there’s no concept of air supremacy in this world yet, the Airships can be considered to be invicible. Magic Reinforcement Cannons are installed on the Airships. The Airships which could be called an air fortress also had the largest magic canceller devices installed in them. In control of each devices was the elite-wizard-class member who commanded the magicians. In battle, the Airship  fires the magic cannon that has the equivalent power of the main armaments of the 4,000 Magic Tanks, thus, it can kill with one shot of the magic cannon a  Young Dragon  of A Rank.

Magic Canceller (Magic Essence Disturbance Radiation). It can obstruct a magician’s casting. A technology that enables the weakening of a monster in battle.

The Magic Beast Corps: A Group of Beast Riders and Chimera Knights.
From the four corners of the world, the Empire brought back beasts of wonderful strength and forced them to obey. They symbolize the Empire’s strength. It is the Magic Beast Corps that handle various of these captured magic beasts: they breed, strengthened, and trained them. The cultivation of the Magic Beasts was processed by DNA analysis - the technology of the Other World that allows the strong soldiers of the Empire to ride the beasts.

Those strong soldiers with were said to have the blood of heroes who played an active part during the early days of the Empire in the old times. Different from how Magic Remodeling technique that changes an ability-less person into a hero, they are born Heroes having an overwhelming ability. A minor Corps with only 30,000 personnel (every single Members are A Rank). It was said that each one of them had the ability of 10,000 people while the Magic Beasts that they rode all had the strength appropriate to A- Rank.

The Mixed Corps: A Group of Engineer Rejects and Beast Exiles.
These members are too powerful and/or too smart to work as a single organization as it is generally thought so, However, while it may be true that they were dropouts, it didn’t mean they don’t have abilities. As such, instead of battles and warfare, various experiments and trials are carried out by this corps. The corps has its own technology development department. It also has magic research department. Their potential is unknown.

This corps employs the most number of Otherworlders as combatants. The total number of soldiers is 200,000 people. However, a lot of them were intelligence officers and general office work soldiers, making the number of soldiers that can actually fight around 100,000 people.

In additon, people who are in disfavor of Magic Remodeling, people who can’t ride Magic Beasts and people of the former Magic Corps that have no place to go were taken into this corps.

The Royal Knight Corps: 100 Empire's Greatest Elite Fighting Force.
They're the one who guard, receive the order and are under direct control by the Emperor himself - Only consist of 100 A rank Member. Royal Knight No.1 is a Sage who is bestowed with Myth Grade Equipment by the Emperor himself. Royal Knights No.1-10  are also Sages who had received Ultimate Gift "Alternative" from the Emperor himself. Each and every single member except No.1 Royal Knight receive Legend Grade Equipment from the Emperor himself.

Method of Attack for Tanks and Airship (Armored Corps)

 * Along with the shell type that packed magic essence and increased the destructive power, the Magic Tanks contained another attack that fired a converged magic essence gathered from the air like a beam. If it’s a shell, it’s possible to accomplish rapid fire even if the quantity is limited. In case it’s a beam, energy charge takes time of a little over three minutes but there’s no quantity limitation for it. Because it’s possible to alternate between these two types of attacks, the beam type is shot first and the normal shell is shot during the time it takes for the next beam to be charged.


 * Adjustment of the magic amplification cannon was vital to every Airships. Also, the magic barrier was laid out to always protect the Airships. Furthermore, Shield (Wall Shield), which is a magic to deal with physical attacks, is amplified to prevent attacks to the Airship. The spell of the magician who usually fire it is amplified to 20 times of its power by the magic amplification cannon. It's a cannon only in name since it’s actually just a pedestal with an ability to amplify the used magic. A huge spell control orb was made with a magic stone of high purity. Originally, orbs which were attached to staffs were as big as a fist to enhance spell amplification effects, allowing various large-scale magics being able to be casted.

Dwargon
Dwargon was able to establish diplomatic relations with The Eastern Empire and so avoided a potential invasion. This was due to the military strength of the kingdom while the strength of the Dwarf King also certainly has something to do with it.

Tempest
The Eastern Empire is under control of Rimuru Tempest. but in exchange of their independence Rimuru Confiscate all of their technology including the right to construct and use Airship, Magic Tank and forbid Magic Remodeling Technology usage to their citizen.

Departments

 * Technical Department


 * Supplies Department


 * The Intelligence Bureau: Intelligence agents are of first-class combat abilities holders. (every single Members are A Rank and could defeat Nameless Arch Demon on  a "one on one" fight)

Known Members
Emperor: Ludra Nam Ul Nasca

Scorch Dragon Velgrynd: Living in The Empire to observe and support Rudra

Royal Knight Corps: 100 Empire's Greatest Elite Fighting Force.
Kondou Tatsuya: Leader of Empire's Intelligence Bureau, Leader of Royal Knight Corps and No.1 Royal Knight.

Damrada: Vice Leader Of Royal Knight Corps and No.2 Royal Knight.

Graneet: No. 3 Royal Knight (a Sage and Hero who laid the foundation of the Eastern Empire and has protected the Empire's peace for more than a thousand years behind the scenes)

Gardner: No.4 Royal Knight (a sadistic Sage who loves to toy around with the enimies while enjoying them crying and begging for forgiveness)

Garcia: No.5 Royal Knight (a short-temper and impatient Sage)

Miraza: Member of Empire's Intelligence Bureau and No.6 Royal Knight

No.7-10: Members of Empire's Intelligence Bureau

No.17: Khrishna (defected to Tempest)

No.35: Bazan (defected to Tempest)

No.94: Reiha (defected to Tempest)

Armored Corps: A Marvel of Technology by Imperial Engineers.
Calgurio: The Corps Commander (Leader/General) of The Armored Corps (defected to Tempest)

Miranda: Military Advisor (A Spy from Yuuki to monitor and manipulate Calgurio)

Gastar: Lieutenant General who commanded Magic Tank Division

Minute: Major General who commanded and oversaw the dungeon capturing troops

Faraga: Major General who commanded 100 Airships fleet

Xam’d: Major General who commanded 300 Airships fleet

Kansas: Colonel and Hero who commanded the annihilation of a Youma village.

Raymond: Otherworlder soldier (defected to Tempest)

Michel: Otherworlder soldier (defected to Tempest)

Mixed Corps: A Group of Engineer Rejects and Beast Exiles.
Kagurazaka Yuuki: The Corps Commander (Leader) of The Mixed Corps

Claude: Vice Leader of The Mixed Corps (A Spy from Leon Cromwell to monitor Yuuki)

Arios: Otherworlder soldier

Tolneod: Otherworlder soldier

Aria: Otherworlder soldier

Orca: Otherworlder soldier

Priscilla: Otherworlder soldier

Mai: Otherworlder soldier (defected to Tempest)

Tanimura Shinji (defected to Tempest) Major who had the qualification as an army doctor

Mark Lauren (defected to Tempest) First Lieutenant who rely on his throw ability

Zhen Liu Xing (defected to Tempest) First Lieutenant who rely on his Sense ability

Gadra: (defected to Tempest) Imperial Court Magician and Former The Corps Commander (Leader) of The Magic Corps.

Magic Beast Corps
Gladim: The Corps Commander (Leader) of The Magic Beast Corps

Vega: Gladim's Subordinate (A Spy from Yuuki to monitor Gladim)

Trivia

 * In Truth, Most Combatants from Sovereign Alliance of the Nasca Namrium Ulmeria Empire don't have Ultimate Skills and their power is only artificial from Magic Remodeling (not by their Natural Talent) thus once they fought against Sentient and Intellegence A Rank Monster they tend to be unable to do anything against it.
 * In Truth, the Fact about their General (Corps Commander) have the power to surpass Demon Lord is nothing but a Lie from Over-Confident and Ignorant People (only Yuuki is the Exception).
 * Only Rudra, Velgrynd, Yuuki and Royal Knights No.1-10 have the power that surpass The Self-proclaimed Demon Lord.
 * Rudra only considered the Sovereign Alliance of the Nasca Namrium Ulmeria Empire as nothing but a tool to achieve his own Goal.
 * The Military Police Corps is far Weaker than the Army Corps (like a child and an adult).
 * A Nameless Arch Demon is strong enough to destroy one of The Eastern Empire's vassal state.