Story

Second Seed, 4E 207
Tiberius Direnni kills a Thalmor Justiciar and runs. This leads to him being recruited by Astrid and joining the Dark Brotherhood. Amaund Motierre awaits the Dark Brotherhood in Volunruud, after performing the Black Sacrament. Eventually, an assassin is sent to speak with him, and he reveals his target:  Emperor Titus Mede II. The Dark Brotherhood agrees to the contract.

In Cyrodiil, Elder Council meets. The most prevailing subject is that dragons are rising around the provinces, and whether or not they should get the help of the Dragonborn. The Thalmor representative mentions the rumors of Blades and the Dragonborn's possible involvement.

Aran, brother of Keyne, seeks out his missing sister, venturing from the Reach and towards Windhelm.

The Dragonborn makes his way to Solitude, to speak with an old friend who says he knows about his father. He arrives around the time of Vittoria Vici's wedding--witnessing her murder as a giant statue topples upon her.

The King of Sentinel accepts the betrothal of his daughter to Prince Adrian Mede. Arrangements begin.

Midyear, 4E 207
Wedding plans are underway for Adrian and Nashari. Vittoria Vicci and her husband are murdered at their wedding by a falling gargoyle. Gaius Maro is killed and implicated in a plot against the Emperor. Cicero flees the sanctuary, and Keyne spares him.

Prince Adrian Mede and Nashari are wed. After his son's wedding, Titus II Mede comes to Skyrim to investigate, but at Maro's urging, is replaced by his double. Titus Mede II meets with the Dragonborn on the Katariah, asking him to convince Ulfric to put an end to the Civil War and to help the Empire against the dragons.

The Dragonborn agrees and sets out for Windhelm on the back of Odahviing. He shows the Jarl the evidence. A broken Ulfric agrees to put an end to the war once and for wall, and calls off his troops. His only terms are that the White-Gold Concordat is abolished and Talos worship is restored.

The Dragonborn sets out for Windhelm, and he and Leopold retrieve the Elder Scroll from Urag. With Serana, they find the entrance to the Soul Cairn. Cassian is turned into a vampire lord so that the Soul Cairn's nature will not leech him. He defeats and befriends the dragon necromancer, Durnehviir.

The three perform a ceremony at the Ancestor Glade, attracting gypsy moth swarms so that the scrolls can be read. The scrolls tell them the location of Auriel's Bow.

Keyne kills the Gourmet and takes his place. The Emperor's double dies of poison. After an encounter with Commander Maro, she flees to the Sanctuary.

The Dark Brotherhood Sanctuary is burning, with many of its members killed. Only Nazir, Keyne, Babette, and Cicero survive, along with the Night Mother. It is revealed that Astrid is the traitor, and she is killed, Keyne taking her place. The Dark Brotherhood is moved to Dawnstar.

The Dragonborn and the Vampires travel to Darkfall Cave, eventually meeting Knight-Paladin Gelebor, who tasks them with slaying his corrupted brother in return for Auriel's Bow. They return to confront and slay Lord Harkon.

Keyne finishes the contract, killing Emperor Titus Mede II, then returning to Whiterun to tell Amaund, before honoring the Emperor's request and killing him.

Elenwen hires a Dark Brotherhood assassin to kill Prince Adrian Mede, but it is too far and they are stretched too thin.

The Dragonborn heads to the Imperial City. He agrees to align with the Empire, and gain the allegiance of dragons.

With Titus Mede II dead, Adrian Mede assumes the throne, taking the name Titus III. Under his orders, Ilarwe goes to High Rock to hunt down the Totem of Tiber Septim.

Sun's Height, 4E 207
The Moot in Skyrim convenes, and picks a new High King. The Empire begins to prepare for the Second Great War. Hammerfell joins the Empire in alliance.

Abolishment of the White-Gold Concordat. Thalmor and Aldmeri within Cyrodiil, High Rock, and Skyrim are captured and imprisoned. Those that escape burn their information and flee for Aldmeri territory.

The Aldmeri Dominion declares war on the Empire.