On the 2nd of Eleasis, 1497, exactly fifty years after Naja Bellandi signed her pact with Zariel, the Companion turned black and teleported Elturel and everyone inside of it into Avernus, leaving a massive crater behind that was quickly filled by the
Chionthar River. This triggered the transformation of Zarielites scattered throughout the city to transform into devils, quickly throwing the city into chaos as nearly its entire leadership was revealed to be infernal turncoats. These former Elturians-turned-devils, referred to as the
Hell Knights, began slaughtering their former comrades-in-arms and any magic users alive in the city to bring more Hell Knights to their side and destroy any resistance against them respectively. They then began hunting the families of Hellriders and members of the Order of the Companion, further swelling their numbers, while securing the only two bridges that connected the eastern Dock District with the two western districts of the city. The Hell Knights were led by
Janfire Mistmore, the leader of the Order of the Companion and the highest ranking Zarielite left in Elturel, who organized the efforts to control Elturel from his manor in the High District.
The Hell Knights control over Elturel wasn't absolute, however. Many of the Zarielite cultists who flocked to Elturel in the days before its damnation treated the event more like a never ending celebration than a military affair, and three major bastions of resistance had formed across the city. Most of the surviving, non-Zarielite Hellriders had gathered in
Helm's Shieldhall under the command of
Alcor Miursa, who later turned over command to his son
Kaiden and
Onthar Frume of the
Order of the Gauntlet when Alcor led a force into Avernus proper to find some way to save the city. Ulder Ravengard, who had survived the city's initial descent, rallied his
Flaming Fist personal guard and a few Hellriders in the city's
High Hall, though they were generally few in number taking heavy casualties from repeated Hell Knight attacks. Most surprisingly, Klav Ikaia was revealed to have survived the Reign of Vampires and had been training a force of
dhampirs in the city's
Maze. Ikaia and his forces emerged from the Maze and quickly established a refuge in
Shiarra's Market. Each of these three bastions also contained a large number of civilians seeking shelter from the chaos outside.
Janfire, believing that High Hall was bound to fall any day now, decided to focus his efforts on
besieging Helm's Shieldhall, knowing that if it fell the bolstering of his ranks from the dead Hellriders and their families would give him the strength to also crush Shiarra's Market, formalizing his control over the city and destroying any resistance that could stop it from sinking into the Styx.
Meanwhile on the Material Plane, the nation of Elturgard was thrown into chaos by its capital's disappearance, and the various city-states that formed the nation began fracturing away from one another. Additionally,
Najara, a kingdom of monsterous races to the north of Elturgard, began taking advantage of the chaos by expanding south. Baldur's Gate, Elturel's historically rival, was unable to take advantage of its disappearance due to the power vacuum left by Ravengard's presumed death. The Flaming Fist began
fracturing in its attempt to find a replacement Grand Marshal, and Duke Vanthampur began using her relationship with the Baldurian cult of the
Dead Three to assassinate Elturian refugees that were or were related to Hellriders. Despite managing to assassinate Duke
Dillard Portyr, Vanthampur was stopped by the Lost Star Detectives, a group of adventurers that narrowly avoided being dragged into Hell with Elturel. While working for the Flaming Fist, the Detectives discovered Vanthampur's crimes, killing her, Thavius Kreeg, and taking both the Shield of the Hidden Lord and an
infernal puzzlebox containing Bellandi's half of her pact with Zariel.
Traveling to
Candlekeep to open the infernal puzzlebox, the Detectives were also joined by the amnesiac
hollyphant Lulu, who revealed to all that Zariel had once been an angel and Lulu was her closest friend. Hoping to save Elturel, the Detectives teleported into Elturel's Dock District just as the Siege of Helm's Shieldhall was beginning. The Detectives first worked with Klav Ikaia to secure the eastern portion of the city, though chose not to engage a growing demonic base in the docks themselves, and then fought across the bridges to the west, relieving the attack on High Hall. The group then retrieved the
Helm of Torm's Sight from the Elturel Cemetary, receiving a vision from Torm encouraging them to find
the
Sword of Zariel, and then ended the Siege of Helm's Shieldhall, though one of their own,
Xifira Mistmore, the daughter of the Hell Knights' leader Janfire, was killed by her own father.
As the situation in Elturel was stabilized, the Detectives left for Avernus proper to save Elturel, first locating the keys needed to unlock the Companion, rewiring the controls for the chains binding Elturel to release when Bellandi's pact was broken, and then finding parts needed to operate the
Fort Knucklebones Dream Machine to help Lulu remember where Zariel's Sword was left. During this time, the Detectives also unwittingly released Gargauth from the Shield of the Hidden Lord. Meanwhile, the survivors in Elturel settled in for a long wait, now that the Hell Knights are their leadership had been broken. Shiarra's Market, High Hall, and the shieldhall all rebuilt and expanded their defenses while finding more and more civilians, rescuing them from the demons that still prowled the streets that wanted to kill all the Elturians before their souls were forfeited to Zariel. These three refuges were later joined by another at
Maiden's Leap, which was protected and blessed by a ki-rin named
Enki the Detectives freed on their journey.
As Elturel sunk lower and lower, the
demon lord Yeenoghu began gathering a massive army of demons and
gnolls outside of Elturel, aiming to destroy the city and all inside. The counter Yeenoghu, Zariel called a Blood Legion to defend Elturel, the the forces of Hell and the
Abyss stood in an uneasy stalemate, waiting for the other to make the first move.
After retrieving the Sword of Zariel, which was taken up by
Alesine Zadava, the Detectives returned to Elturel shortly before its ultimate submerging in the Styx. After making last minute preparations, the Detectives unlocking of the Companion signaled the beginning of the
Battle of Elturel, as the forces of Hell rushed to stop them and the forces of the Abyss moved to destroy the city. In the resulting battle, the two fiendish armies clashed on the fields of Avernus while demons that managed to slip through the infernal lines swarmed into Elturel to destroy the last bastions of resistance. The Lost Star Detectives freed the
solar trapped inside of the Companion, and held off Zariel's forces long enough for Zariel herself to arrive to stop them. The Detectives then gave Zariel her old sword, which contained a spark of her celestial, uncorrupted essence, and successfully encouraged Zariel to redeem herself, becoming an angel once again. The Detectives then split to protect High Hall and Shiarra's Market while Zariel defended the city long enough for the Companion to charge and teleport Elturel back to the Material Plane.
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