Primarch return.

Now that Horus has returned, the Empress asked whether he wants the aspirants to keep coming from Terra or if he would prefer Aspirants from his home world. He believed it would be better for the children to become Space Marine's then to grow up on Cthonia like him. So all Astartes from his legeon would come from Cthonia from now on.

Not only are the Luna Wolves the only Space Marine's with their Primarch, no other leagon would get a Primarch for another 30 year's. Soon the Luna Wolves would overtake the 1st legeon as the most successful legeon much to the 1st's distaine.

Eventually Cthonians joined the Luna Wolves ranks. The 1's from Terra did not like their new brothers. Even though they didn't spend their teenage years on Cthonia, they still spent their childhood years there. The Terran Space Wolves didn't like how they acted like criminal's. They still work with them on missions but they didn't like it 1 bit.

The Empress was very kind to Horus. At 1 point Horus was being shot at. As Horus was wounded on the ground, the Empress used her body as a Sheild to protect him. Eventually Horus did fall for the Empress and became a part of her harem, much to Erda's shagrin. However she did get used to before any of the other Primarchs where found. Even after the other Primarchs where found, it was clear Horus was still the Empresses favourite. Erda did tell the Empress to treat the Primarchs equally but she couldn't get over her favouritism.

Erda is always very motherly to Horus. At first she was overprotective of him and treated him like a child. Malcador had to help her overcome this and treat him like an adult. Erda did apologize and forged a more healthy relationship with Horus.

Horus made a harem of his own the Empress never touched. It mostly consisted of Cthonian girls, Mechanicus girls and navigator girls.

During a battle with the Goff Ork's, the Luna Wolves gave them the worst beating of their lives. Ork's believe colours have different properties. Because of this 1 battle, the Ork's believe black and white is the strongest colour. So this is the reason Goff Ork's wear chess board patterns on their armor. Because of this tremendous victory, the Empress renamed his leagon the Son's of Horus. Horus didn't want to change the name of his leagon since he thought this new name was pretentious.

The other Primarchs like Horus. They think of him as a good guy and they find him dependable. They are also jealous of him because he's clearly the Empresses favourite.

1 day the Empress decides she needs to focus on giving humanity access to the web way. In the original canon the Emperor keeps this a secret from the Primarchs for some reason. Like keeping the Chaos Gods a secret kinda makes scenes since they get more power the more people that know about them. However he gained nothing by keeping his web way project a secret and alot of problem happen because he chose to keep it a secret. Unfortunately I don't think fusing with Slaanesh would make him smarter. So the Empress will make the same mistake.

She needs somebody to run the armys as she works on the project. So she go's to Horus and declares him Warmaster. She then leaves him in charge. The Empress made him a special mall called the World Breaker and gave it to him. She then told the other Primarchs that they work for Horus now and disappeared without telling anyone why. This strained Horus's relationship with his siblings even further.

A Mechanicus named Urtzi Malevolus created a claw gauntlet similar to the Empresses they dubbed the Warmaster's Talon. They gave it to Horus. It quickly became his favourite weapon and a symbol of his rain as Warmaster.