Massacre at Katze Plains

In the winter of January–February of the second year after the transfer, Ainz joined the annual war on the Katze Plains at the Empire's invitation, massacred about 180,000 Kingdom soldiers with super-tier magic, took E-Rantel, and founded the Sorcerer Kingdom of Ainz Ooal Gown.
- Cause: the Empire declared it recognized Nazarick under Ainz as a nation and had allied with it, demanding that the Kingdom "return" the area around E-Rantel or else it would help the Sorcerer King reclaim it
- Forces: the Kingdom army fielded 245,000 (actually deployed), the Empire six legions of 60,000 (previously at most four), and the Sorcerer Kingdom only about 500 undead riding Soul Eaters (including Ainz and others)
- Ainz cast the super-tier spell 〈Iä Shub-Niggurath〉 (黒き豊穣への貢), instantly killing 70,000 on the Kingdom's left wing, and the five Dark Young it summoned went on trampling the Kingdom army
- Kingdom dead numbered about 180,000 (over half of its soldiers), about 2% of the nation's population of 9 million; Gazef refused recruitment and died in a duel with Ainz. Before the battle, First Prince Barbro led a separate force to attack Carne Village, was repelled by the 5,000-strong goblin army summoned when Enri blew the horn a second time, and was later tortured to death by Lupusregina (treated as missing by the Kingdom)
- Imperial dead numbered 143 (mostly trampled in the rout), and 3,788 applied for discharge after the war; the Black Scripture's "Thousand Leagues Astrologer" witnessed it, despaired, and shut herself in
- In the spring of the second year, E-Rantel officially became Sorcerer Kingdom territory and its capital
- Although the Slane Theocracy had claimed E-Rantel as its own territory in past years, this time it wrote to the Kingdom that "our nation has no record of this; if true, we acknowledge the Sorcerer King's legitimate claim to E-Rantel" (9-165)
- Kingdom deployment: 105,000 of the royal faction in the center and 70,000 of the noble faction on each wing; Marquis Raeven was supreme commander, and Marquis Boullope led the left wing, contributing over 50,000 troops; the Imperial army was commanded by Carvain, general of the 2nd Army (9-157–176)
- Boris and four other former orichalcum-rank adventurers under Marquis Raeven died confronting the Dark Young to cover his retreat, and his commoner-born strategist also died (10-157); on the Imperial side thousands developed PTSD (10-263)
- Web novel: the Kingdom fielded 200,000, Ainz brought 300 Death Knights riding Skeletal Dragons, 〈Iä Shub-Niggurath〉 killed 50,000 on the Kingdom's right wing, the Dark Young killed Marquis Raeven as he fled on horseback, Kingdom dead were about 130,000 and Imperial dead zero; Ainz also collected experience points with "Avarice and Generosity" (Web "Massacre")
Related characters
- Ainz Ooal Gown
- Gazef Stronoff
- Jircniv Rune Farlord El-Nix
- Elias Brandt Dale Raeven
- Climb
- Brain Unglaus
- Barbro Andrean Ield Ryle Vaiself
- Thousand Leagues Astrologer (7th Seat of the Black Scripture)
- Boris Axelson
- Marquis Boullope
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