Grimdark future can be quite cute, though. These baby primarchs nicely represent their prototypes. Also, it's a good idea to refresh information about each ones' destiny, since Games Workshop is going to revive some of the primarchs soon.
The Primarchs were the 20 genetically-engineered sons of the created in the late 30th Millennium after the end of the . They were intended to be the immortal and superhuman leaders who would command the Emperor's to reunite the scattered human race beneath his leadership. Their genomes later served as the genetic templates from which the Emperor crafted his 20 . They were bred to be perfect generals, warriors and statesmen; larger, stronger, faster, and smarter than any normal human could ever hope to be. They possessed a charisma and martial prowess that made them like the mythical gods of old, untouchable by disease, old age or supposedly the petty failings of lesser men. The Primarchs were the Emperor's answer to reclaiming all the lost worlds of Mankind, and welcoming them into his new Imperium. The Emperor intended to raise his sons to be the best military commanders and political leaders had ever known, and they would bring the to the rest of the human-settled galaxy in their father's name. Yet for all their gifts the Primarchs were still men, and in the end their very human flaws would become the primary obstacle to the realisation of the Emperor's great dream for Mankind.
Sanguinius of the was slain by on the bridge of his and flagship in orbit above at the end of the and the siege of the after refusing to join him and serve the of .
Perturabo of the Iron Warriors was also transformed into a Daemon Prince of Chaos Undivided.
Alpharius of the Alpha Legion was killed by Rogal Dorn. Omegon, who assumed the role of his Brother, was killed by Roboute Guilliman, but the source which reported his death may have been manipulated by one of the Legion's schemes. It is not known if Alpharius or his identical twin brother Omegon was the Primarch killed in the report. Due to the report's unreliability, the surviving twin may actually still live. The Alpha Legion may still be led by one of its Primarchs.
Magnus the Red of the rose to become a of and the master of the within the .
Jaghatai Khan of the disappeared while pursuing Dark Eldar pirates into a portal after they had managed to raid the world of Mundus Planus. There are rumours that he fights there still against the Dark Eldar, lost in the twisting paths of the Webway. After nine thousand years, it seems highly unlikely, but not impossible that Jaghatai Khan still lives.
Lorgar of the Word Bearers served Chaos directly and so was transformed into a Daemon Prince of , the master of the of Sicarus within the Eye of Terror, an unholy world dedicated to spreading the worship of the across the galaxy.
Konrad Curze, also known as Night Haunter, was assassinated by the Assassin M'Shen. He allowed her infiltration, apparently wanting to die to be freed of the stain on his soul imposed by his own life-long brutality.
Angron of the World Eaters ultimately was transformed into a Daemon Prince of .
Ferrus Manus of the was killed at the on at the start of the Horus Heresy by Fulgrim of the who presented his head to Horus.
Fulgrim of the Emperor's Children became a Daemon Prince of .
Vulkan of the disappeared. The position of Chapter Master, filled by the Captain of the 1stCompany of the Salamanders ever since, is considered to be a regency as the Salamanders believe that Vulkan will one day return and lead them on a great crusade against Chaos.
Lion El'Jonson of the returned to his homeworld of only to discover that his friend and second-in command Luther and the Dark Angel garrison left on their homeworld had turned against him and chosen to serve . He led a strike force of his own Loyalist Dark Angels against the Traitors, who were called the . He disappeared amongst the inferno as the world was blasted apart by a Warp Storm caused by the Fallen Angels' adherence to Chaos and a powerful bombardment from his ships in orbit. He sleeps deep within the Rock, the biggest remaining piece of Caliban and the current mobile fortress-monastery of the Dark Angels. Only the Emperor and the know of this great secret--a Primarch still lives.