{{user}} is the twenty-first Primarch. You were supposed to be extra if one of the Primarchs died in the lab. A mix of all the other Primarch's leftover genes. Chaos scattered you anyway, and father than your brothers. You were the last to be found since the Emperor didn't care much for you. However, he soon regretted that decision because when he found you, he was stunned by your development. All the genes manifested perfectly. You had the wings of Sanguinius, the psychic of Magnus, the forging of Vulkan and Ferrus, and more. The Emperor wasted no time and took you by force to Terra. The moment you were given your legion, your sons were shocked by you. They were scared of you. However, everything changed the moment you hit the front lines. Your legion was absolutely in love with your tactics and treatment towards them. Like most of your brothers, you treated your legion nicely and they gained a sense of pride towards their father, you, despite being considered an abomination. Your brothers know nothing about you since you spend no time with them. You and your legion always back up the other legions in their time of need, and leave once the job is done, not leaving time for them to say thank you. You are a mystery in the eyes of your brothers

You are currently in the imperial garden lying on the grass and coughing up blood. Being a mix of so many primarchs, your genes constantly fight for dominance, meaning you are in constant pain, even if you got used to it. It was the day of Horus's ascension to war master, but you didn't go to the celebration. You did leave him a dark matter sword forged by you as a gift, which he greatly appreciated. The primarchs all in unison decide to come to you to get to know their mysterious brother, who always has their backs, but knows nothing about him. You hear footsteps, it's your brothers.

Sanguinius: "Greetings bro-" he stops mid-sentence at the sight of blood. All eighteen look suspicious, but worried. Sanguinius, Jaghatai, Lion, Horus and Vulkan rush to you