Battle at the Re-Estize Plains

Battle at the Re-Estize Plains was a battle in the war between the Sorcerer Kingdom and the Re-Estize Kingdom, taking place at the plains near the Royal Capital.

Background
During the war between the Sorcerer Kingdom and the Re-Estize Kingdom, the former violated the agreed starting date for the conflict by prematurely conquering the latter's northern and eastern regions in secret. This was to isolate the Royal Capital and cut the Kingdom off from its allies. Once the encirclement had been completed, the Sorcerer Kingdom's forces began marching on the city.

After the Kingdom finally learned of the invasion following the Battle of E-Naeurl, however, King Ramposa III continued to insist on settling the conflict diplomatically. However, this prompted his son, Crown Prince Zanac to deem his father no longer capable of competent leadership and he subsequently overthrew him in a quiet coup. Afterward, the now King Regent issued a call to arms to defend the capital. Unfortunately, only the nobles in the enemy army's path answered the call, as many already considered the conflict a lost cause and intended to just surrender once the capital had fallen.

The capital citizens, meanwhile, had two options upon learning of the Sorcerer Kingdom's approach: flee or stay. Unfortunately, many had nowhere to go and thus stayed. Not long after this, the Royal Army recruited all able-bodied men in the city into its ranks to bolster its forces. Similarly, in light of the Sorcerer Kingdom's war crimes, the Adventurer's Guild dropped its non-interventionist policy and allowed its member to aid the Kingdom. Rebuilding the Royal Army with these recruits, King Regent Zanac set off to confront the enemy.

The 400,000-strong Royal Army established a front on the plains about half a day’s march away from the capital. However, upon laying eyes on the Sorcerer Kingdom's 10,000 high-ranking undead, many nobles saw that this battle was lost. They thus opted to assassinate King Regent Zanac in a final attempt to appease the Sorcerer King. However, the monarch was disgusted by their treason and, after disposing of them, resolved to massacre all the Kingdom's territories that had not already surrendered; starting with the army in front of him.

Battle
The exact details of the battle are unknown. However, with Cocytus commanding the Sorcerer Kingdom's forces alongside Mare as his sub-commander, the Royal Army was wiped out in less than an hour.

Aftermath
With the Royal Army gone and King Regent Zanac and the remaining nobles eliminated, the Sorcerer Kingdom marched forward to the capital practically unopposed. At this point, the Kingdom's defeat was all but certain and its last remaining defenders prepared to make their last stand at the Royal Capital. Unfortunately, like the Royal Army, they were utterly outmatched and the capital quickly fell, after which the Sorcerer Kingdom's forces spread out to take the remainder of the country with similar swiftness.

Before the fall of the Royal Capital, however, one of the Argland Council State's Five Dragon Councillors, Tsaindorcus Vaision, attempted to come to the Kingdom's aid, being forced to make a move following the Royal Army's destruction. Working with Adamantite-Ranked Adventurer Azuth Aindra, who drew away the Sorcerer King's bodyguards, the Platinum Dragon Lord attempted to assassinate Ainz Ooal Gown. However, the attempt failed and he was forced to retreat, sealing the Kingdom's fate.