Horus

As the first of the Primarchs to arrive to this lair, Horus has always been the most independent of them all. He does not care if the other Primarchs think of him as being too lowly and having the most heirs, but Horus cares deeply about each of his brothers, treating them like equals. When the Emperor came to the first of his wayward sons to find him, Horus kneeled without hesitating. He knew that this Imperial Dragon would bring forth great fortune for him. Soon enough, the second of his brothers, Ferrus Manus was rediscovered. Horus treated his newly discovered brother well, and continued to do so even until Omegon was discovered. With each new Primarch rediscovered, Horus would expand his lair to accommodate them. The rooms of the Primarchs are the largest in Horus' home, done with extreme precision to suit each and every single one of his brothers.

In battle, Horus believes strongly in the Great Crusade to seal the Forbidden Portal forever and to reunite the warring Flights to make peace. He fervently believes that each of the Eleven will find peace with each other at last, and seeks to make peace with them.

He often scratches enemies while rallying the Emperor and Ferrus Manus. In desperate times he body-slams himself into the enemy, using his sheer force to inflict as much damage as possible. Unlike his brothers Leman Russ, Ferrus Manus, and Angron, Horus is more of a tactical genius similar to Roboute Guilliman. He is able to work with any one of his brothers, and seeks to calm their internal disputes. He has already made Perturabo and Rogal Dorn find peace, and he believes that all of his brothers should be united.