Imperium Asunder Campaigns

So here's a wiki page for the campaigns of the Imperium Asunder Universe.

Campaigns of the Heresy

Siege of Terra

The Exodus

At Terra, the Warmaster sneaks in, disguised as a Custodian and assassinates the Emperor. There's a few primarchs on hand, and they're on the walls in the maelstrom of battle, so Klaus goes after him while Faustus and Engerand? (or one of the other Primarchs) remain to keep the front stable, as best they can. They organize a retreat. Faustus takes the Emperor's body and puts it in a stasis casket guarded by a special Oathsworn detachment. Probably an honor guard of Custodes, too. He loads it onto a ship. Engerand loses track because FUCK FUCK FUCK, Klaus is dead too, now. All seems lost when the combined Scion and Sky Serpent drops out of the warp. They cover the retreat as Faustus drops the moon. Somehow, the Casket ends up on the Scions flagship. Cue dramatic scene where Sarco looks down from his casket and can't even touch his father. Dreadnought tears.

So the Scions and Serpents cover the retreat all the way back to Amaranth, mostly Scions since Xun speeds off to Tepectitlan. They reach Amaranth as the storms worsen. Ships are unloaded with the treasures and relics of the lost West and hidden in the catacombs of Amaranth as a bunch of Judgement Bringers begin the Century Siege. So the Custodes and Oathsworn stay with the Casket down in the Omega Vault, while above them the siege rages. The whole sector is under siege, really. (The other option is that the Casket is picked up by the Scions, it's guard having been slain or something.)

Crusades

Great Crusades

1st

Loyalists push back. Judgement Bringers and Negators fight their way toward Amaranth but get stalled eventually. Loyalist forces are sent packing back beyond the Tempestus Gap.

2nd

Waaagh! The Beast is in full swing and the loyalists attempt to take advantage. The Maelstrom Zone is retaken and holdouts are established throughout Segmentum Tempestus. Engerand loses an eye to Kashaln.

3rd

Spearheaded by the Judgement Bringers and Iron Hearts Legions, the forces of the Dark Imperium swarm Segmentum Tempestus in an attempt to scour it of loyalist holdouts. The loyalists respond with a furious counter-offensive, the entirety of the Forgespace and the Unyielding Vigil mobilized to combat the forces of Chaos.

4th

The Void Lords locate a tenuous passage through the Firewall into the Dark Imperium. The Astra Telepathica is mobilized to light the way and a vast host is assembled from every Crusader State, accompanied by household fleets and militant orders. They tear into the unguarded, unprepared worlds on the other side of the Firewall, establishing a beachhead for further offensives. Several gains are lost when the Crimson Warhawks unexpectedly diverge from planned operations, Raydon having heard tell of the Warmaster's location. He boards the Warmaster's flagship and bests the daemon prince, but cannot kill him, and is executed by Kashaln.

5th

The Firewall's light flickers, and a passage opens between the Jade Empire and the Unyielding Vigil. Both Crusader States mobilize to stem the inevitable tide of traitor forces that surge into loyalist space. The fight is bitter and bloody, but comes to an abrupt end when Xun vanishes into the Firewall and it mysteriously reignites.

6th

A champion of Khorne achieves eminence among the warbands of the Chaos Marches, and is given Balthasar's blessing as Huntmaster. The resulting frenzy of violence spills out over the borders of the Storm Kingdoms, worlds burning in its path. By the time the forces of the Kingdoms and the Protectorate have put a stop to the devastation, Engerand has lost his left arm and the border worlds of the Kingdoms lie in ruins.

7th

High-Marshal Engerand, seeking to preserve his domain from further attacks, proposes that the loyalists seek to extend their beachhead on the other end of the Firewall across its northern stretch, creating a defensive line. Forces of the Jade Empire, Unyielding Vigil, Forgespace, and Imperium Minorum push from the beachhead, while Storm Kingdom and Protectorate armies attempt to fight their way around the northern edge to join them. The Warmaster's response is swift and the campaign proves a shambolic failure, the loyalist forces constantly harried by Warp Raider efforts. Engerand is killed by Aodhan, though he manages to teleport them both into the bridge of his burning flagship as it careens out of orbit. The traitor Primarch is not seen again for many years.

11th

Saul Sheridan is brought forth from the Warp as a Daemon Primarch of Nurgle, triggering the Nuglite Schism. Nurgle forces throughout the galaxy mount relentless attacks against all living beings, the Crusader States put aside their differences to form a cohesive counterattack. He launches his omnicidal campaign with the simple command "Apocalypse now."

13th

Warp shenanigans, war on two fronts, a living saint declares this the Last Crusade.