Assassination of Elf King Decem

Assassination of Elf King Decem was the assassination of the Elf King of the Elf Country, Decem Hougan, at the hands of the Extra Seat of the Slane Theocracy's Black Scripture, Antilene Heran Fouche. As intended, it effectively ended the conflict between the two nations.

Background
Following the rise of the Sorcerer Kingdom and later the downfall of the Re-Estize Kingdom, the Slane Theocracy gradually began to push more resources into its ongoing war with the Elf Country, intend on settling the conflict as quickly as possible so they might re-direct their focus toward their new foe. However, despite their forces steadily gaining ground, the Six Cardinals deemed it to still not be fast enough and thus approved a plan to assassinate the Elf King Decem.

Unfortunately, the Theocracy's first assassination attempt failed when the Holocaust Scripture targetted the wrong person and were later defeated by the actual Elf King. As a result, the Cardinals resorted to sending their strongest God-kin, Antilene Heran Fouche, to do the deed. This was a personal matter for Antilene as well, as she was born out of wedlock when the Elf King abducted and violated her mother. When the Theocracy's forces assaulted the Elven Capital, Antilene used the battle as cover while she infiltrated the Elven Palace, intent on killing her father.

Elf King Decem, meanwhile, was arguably having the worst day of his life. Sensing intruders in the treasury, he found two Dark Elves snooping around. Concluding that they must be his grandchildren due to their great power, the Elf King ordered them to bear his offspring. This, however, enraged an undead who claimed to be their guardian. Subsequently engaging the monarch in a duel, the Undead managed to trick him into exhausting his MP and destroyed his Primal Earth Elemental. Beaten and humiliated, Decem fled.

Wounded and fearing for his life, Decem intended to flee the country and start a new nation elsewhere. Upon reaching his throne room, however, he found Antilene waiting for him, having massacred everyone inside. Referring to the Elf King as "Father", Decem assumes her to be the mother of the Dark Elves from earlier. While having no idea as to what he was talking about, Antilene plays along upon noticing his wounds, wondering who or what could have reduced him to such a state.

Battle
Knowing that he cannot win in his current state, Decem turns to leave. Before he can even leave the throne room, however, Antilene instantly closes the distance between them and stabs one of his legs with the scythe, causing him to fall to the ground. The Elf King tries to get up but Antinene states that he is not going anywhere before placing one of her legs on his back, pinning him to the ground.

With the Decem pinned down, Antilene began questioning him about his injuries. However, the Elf King, unable to believe how easily he is being restrained, instead questions her back regarding who she was and why she is doing this to him. In response, Antilene merely laughs at him and states that "the strong can do whatever they want to the weak", pointing out that she is doing the same thing to him as he had done to others until now.

Antilene then increases the strength in her legs and demands he answers his previous questions. However, the pressure with which she bearing down on the Elf King makes it impossible for him to breathe, much less talk, only being able to articulate a few grunts. Watching the pathetic display, Antilene voices her disbelief at how her mother could have been kidnapped by such a "small fry".

Decem, meanwhile, was reduced to a crying mess as he slowly suffocated to death, wondering why this was happening to him. Watching this, Antilene voices her disgust. Finally, the Elf King's body begins to swell up from the lack of oxygen and Antilene, having had enough, crushes his spine, killing him.

Aftermath
As she stared at Decem's corpse, Antilene believed he got what he deserved. Still, she would have preferred to have killed him some other way. Looking at the other bodies in the room, she also wonders if she could have spared them.

Not long after, Antilene notices a Dark Elf girl entering the throne room. From what Decem stated earlier, Antilene initially assumes her to be the Elf King's grandchild, her niece. After striking up a conversation, however, she is shocked when the girl introduced herself as Mare Bello Fiore from the Sorcerer Kingdom, causing her to attempt to abduct her. However, she ultimately ended up being defeated and taken prisoner herself.

Afterward, Sorcerer King Ainz and Mare's older sister, Aura, arrived and, after being informed of the situation, decided to take Antilene back with them for interrogation. This would lead to the Sorcerer Kingdom discovering the Slane Theocracy's role in the Bloody Valkyrie Incident and subsequently declaring war on the nation.

Despite Antilene's capture, her mission initial mission was still a success: due to Elf King Decem's death, he could not participate in the Assault on the Elven Capital and the city fell to the Theocracy's forces.