Mors Accipitres/Death Hawks (Astartes Chapter)

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The Death Hawks are known as  Mors Accipitres in High Gothic, literally Death that comes silently swooping (like a bird of prey). They are of unknown founding, probably M36, and are likely of Fated Sons stock, though no Primogenitor is listed.

In 999.M41 the Death Hawks worked with Wolf Lord Gnyrll Bluetooth's command, seeking to end the Red Corsair threat against Parenexes. Due to some failure on the Hawk's part (or so the Wolves claim - the Hawks don't comment), the Corsairs turned the tables on the Corpse-God's followers and wiped out both Astartes commands. 

The Corsairs began hunting the Hawks actively after this. By 237.M42 they had cornered the Chapter and stood poised to wipe them out. Barotta intervened psychically and had his Eldar allies lead them to safety through the Webway. Two companies were saved, led by CM Vladimir and CL Nicolay.

Astartes Celebrantinum/Celebrants (Astartes Chapter)

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The Celebrants is a Chapter of an unknown M36 Founding and unknown lineage (possibly Fated Sons descendants, but nevertheless Loyal Sons). They are the Astartes Celebrantinum in High Gothic, literally Space Marines who perform the rites (of Battle).

The Chapter served with distinction for many years, until a failure to obey lawful orders directly resulted in the loss of the Crimson Consuls Chapter to an Alpha Legion plot. After becoming aware of the consequences of their disobedience, the Celebrants struggled vainly to be rid of this black mark on their name, going too far, too often. Eventually, only a single fleet-based company-sized group under Captain Agamemnon remained.

Had not Barotta reached out, it's likely the Celebrants would have ended at some point during the current century. The Celebrants are tenacious soldiers, with a special knack for fighting Tyranids.

Loyal Sons

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Something happened the last time Barotta went back. His words put seeds into fertile soil, and something or someone has protected and nurtured those seeds. It's a crop ten thousand years in the making. A crop of Astartes, Loyal Sons all.

Thus far, two companies of veterans, each of a different chapter, have flocked to Barotta's banner, united by the common myth cycle of the Loyal Son (and by extension a Father). It should not be possible, but it has happened. 

Only time will tell how many more there might be.

Research Option: Loyal Sons unlocked.

Dark Sons: 1 company
Templars of Blood: 1 company

Brazen Skulls: unable to establish contact
Celebrants: 1 company recruited
Death Hawks: 2 companies rescued from the Red Corsairs.

Research Option: The Future, Always In Motion unlocked.

Equites Sanginue/Templars of Blood (Astartes Chapter)

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The Templars of Blood is a Chapter of Loyalist Space Marines and Successor to the Blood Angels (perhaps not truly the case, hard to tell, but true sons nonetheless) of an unknown Founding.

Like their progenitor Chapter, these sons of the Primarch Sanguinius take pride in their ability to meet the foe head-on, although this is where the similarities between the Chapters end. The Templars are more of a bolter-drill Chapter than melee-focused assault specialist.

The Astartes of the Templars of Blood are known to suffer from the genetic flaw of Sanguinius known as the Black Rage at a much-reduced rate compared to the Blood Angels or their other Successor Chapters. The reason for this is unknown, though some suspect the Chapter has bought this boon through dark and secretive means (or it could be they are not really Blood Angels, but descended from the Sons).

If, however, a Templar succumbs to the Black Rage, he will be given a final chance to die in glorious battle. If unable to die with honor, he will be executed by his company commander after what should have been his swan-song.

Epistolary Barabas, so named for his mighty beard, the only Templar not to shave, sought to join the Achilus Crusade, but instead managed to become trapped on the surface of Zanatov's Harbour when they were seconded to Inquisitor Adrielle Quivst, Ordo Xenos.

Tenebris Prognati/Dark Sons (Astartes Chapter)

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The Dark Sons is a Loyalist Space Marine Chapter of unknown Founding that claims descent from the lineage of the vaunted Ultramarines Chapter (though it seems they may be of different stock). 

Along with the Angels of Fury, the Dark Sons had the honor of being under the tutelage of the venerable Novamarines Chapter following their inception. 

The Dark Sons' homeworld was the planet Darkhold in the Segmentum Obscurus. Overrun by Chaos forces early M42, the Sons have lived aboard their dwindling fleet of ships ever since.

A certain specter of pridefulness and egotism clings to these warriors and has soured their dealings with other Imperial organizations in the past, but their arrogance is not undeserved. The Dark Sons fight with remarkable efficiency and skill, and have won countless battles against remarkable odds.

Captain Karlson has led the battered strike cruiser Wrath of the Father and his equally battered of the 9th Company of loyal Sons to Jericho in search of a prophecy and a new beginning.