Sweet, well I paint Warhammer 40,000, and here is the story for my current army.
*takes in a deep breath and explains*
The Blood Wolves were created from a Wolf Brother (A 2nd Generation Space Wolf Chapter that failed due to mutation), the Wolf Brother escaped during the culling(systematic extermination of the entire Wolf Brothers Chapter, by the Space Wolves) He floated in space capsule for ten years until he crash landed on a Jungle Planet. The mutation starts to turn him Wulfen, but not all the way, and he becomes a feared beast of the jungle. During a routine hunt for some Orks the Blood Angels land on the same Planet. Scout units report that droves of Ork corpses are found, and a hunt is underway to find the source, seeing at the Orks were clawed and their throats ripped out.
They find the Wolf Brother and are about to kill him as another beast when Chief Librarian Mephiston orders his capture. Back abord their Battle Barg on the way to Baal Mephiston using his Physic Powers to pry into the mind of the Wolf Brother. After ten days without food or water Mephiston emerges from the room, covered in blood and scares. The Wolf Brother walks out, one eye gold, one blue. He doesn't remember anything about the culling or his time on the Jungle Planet. Yet he knows once they reach Baal that he isn't like the others.
The Blood Angel Surgens and Priest were able to remove the Mutation, over the course of weeks of painful surgery. Yet Mephiston was always there keeping the Wolf Brother, who was now know as Tyrian, focused and alive. While on Baal he wasn't permitted to join the Blood Angels and the Arostrocricy despized him. He was a loud and prone to starting fights over food. This lead to him being put into a gladiatorial match, in hoping it would kill him off. Yet in the end he stood victorious.
He spent his next five years fighting and become champion of Baal. Yet he started to have dreams, terrible dreams of someone he kept calling Father, a god like man, in a desperate battle against demons(His dreams are of Russ, and the Demons are Warp Spawn). He meets with Mephiston and Dante and request that he go after his dreams, that he cannot stay on Baal when his Father is out their lost and in need of help. They agree, but they will not send him alone. They also cannot afford to send him with any Blood Angels.
"Give me an army." He requests, and Dante smiles. Over the next ten years Tyrian and Dante search space for the most inhospitable planets and recruit for his new army. Given Tyrians now cleansed Gene Seed a Chapter is Formed, the Blood Wolves. The name is created after Mephiston reveals Tyrians past to him, in the form of a armored shoulder pad with the Wolf Brothers Icon on it.
Having been raised around the Red Armor he adopts it as his own, and pains on the Wolf Icon. Then he and his new Chapter set out on their Battle Barg and search all of Space for Russ. While on a planet helping the local Imperial Forces fight off some Dark Elder Tyrian hears of "his brothers in Blue". After some investigation thinking he had found his father he plots a course for Feneris(Space Wolf Homeworld).
There he is greated by his former brothers who are unsure where the Wolf and his Chapter come from, but welcome them as Space Marines non the less. With a great feast and mass amount of drinking Tyrian explains to the Great Wolf what he is doing. The Great Wolf blesses his quest and the next day the Blood Wolves are off again. Yet a Rune Priest comes up to the Great Wolf and says,"He is the Lost Brother, what should we do?"
"We let the Lost Son find the Lost Father." The Great Wolf spoke.
If I get around to it I will post my current army list.