Undying Scions timeline

M31
The Warmaster’s Heresy
-Dismayed by death of the Emperor and the incapacitation of their father, the XVIII legion retreats to Amaranth and its surrounding worlds.

The Council of Titans
-The Undying Scions send a small delegation to the Council of Titans, but does not speak.

M32
Forging of the Vigil
-The Undying Scions begin a war of conquest to reunite worlds in the western Ultima segmentum. The campaign finishes with the destruction of two entire battle companies of Iron Hearts upon the world of Sarco Primaris, whose original name has been excised from Vigilant records.

-The Karadon Cold Ones are founded.

M33
Vigilance Without End
-Battlefleet Vigilance is founded, and is baptized in blood in the Second Crusade where the Undying Scions retake the Maelstrom zone.

-the world of Hadrianus is beset by a daemonic invasion. First known use of the Baleful Blade to divine where the Scions are needed most.

M34
Divided We Stand
-In order to more effectively police their domains, the Undying Scions follow the example of Imperium Minorum and split themselves into independent successor chapters, each two thousand strong.

Expansion
-Following the liquid iron drops of the Baleful Blade, the sons of the XVIII legion push into Segmentum Tempestus and expand their territory.

M35
The Fire Rises
-The Undying Scions’ primary recruiting world, Amaranth, is attacked by Eldar corsairs. Five hundred aspirants fall defending the complex where the Baleful Blade has its place of honor.





M36
The Teliom Crisis
-Forgeworlds across the Teliom Sector suffer from rogue heretek attacks and servitor uprisings. Two whole chapters are required to put an end to the crisis.

Unwavering
-As a massive hole in the firewall opens up, Idrias Stern leads the defense of the Unyielding Vigil with the single largest detachment of marines since the Great Crusade.

-Sergeant Marius begins his investigation of a mysterious xenos threat

M37
The Ninth Crusade
-The necropolis cult reveals itself and moves to attack the worlds surrounding Amaranth with the assistance of its necron benefactors. Only the timely intervention of the Crimson Warhawks prevents the total annihilation of the world.

Unsung
-The Baleful Blade leads the current High Councilor of Amaranth and his retinue to Feingard, a remote world in the Kor Protectorate. Their fate is unknown, but the Blade later appears in its place on Amaranth. The skies above Cydonia play host to blue-tinged comets for weeks to come.

M38
Swallowed Whole
-One of the Undying Scions’ successor chapters, the Heralds of Hadrianus, are baited into attacking the Negators in their base of operations in a commorite sub-realm. They are never heard from again.

Wisdom of the Ancients
-The Undying Scions send representatives to each of the other crusader states in an attempt to ameliorate the rising tensions between primarchs and gain support for a crusade into the heart of the Dark Imperium

M39
Eldar Resurgent
-Several craftworlds move through Vigilant space towards segmentum tempestus. The Undying Scions are manipulated into attacking forces that may have presented a threat to the Eldar.

Fury of Ages
-Soon after discovering their manipulation, the Undying Scions are led against the rising Eldar Empire by Idrias Stern, who first meets his rival Muirthandril.


M40
Chosen of Eldanesh
-The war against the resurgent Eldar Empire rages on, bringing destruction to scores of worlds throughout Segmentum Tempestus. Notably, Idrias Stern destroys a blackstone fortress in a boarding action.

Undead Vs. Undying
-More and more worlds reveal themselves to be tombs for the ancient necrons. Forces must be diverted from the western front against the eldar to deal with them. The Baleful Blade is instrumental in identifying tombworlds and begins to glow as if molten in the presence of the ancient race.

M41
Terror out of Space
-Battlefleet Vigilance successfully fends off Hive Fleet Megalith

Dire Savagery
-Unbeknownst to the Scions, the Eldar Empire influences several Ork Waaagh!s to attack them. Three chapters of Undying Scion successors are depleted to dangerously low numbers.

M42

-War with the Eldar Empire starts anew, with many successors declaring their intentions to push into the territory of various corsair princes.