Freudian Excuse: Many of the Chaos Primarchs have these to justify their betrayal.Now their names are spit upon by those who still remember them and they seek to destroy the empire they once served. Fallen Hero: Each of them was once one of the Imperium's greatest warriors and leaders.Demon of Human Origin: The surviving Traitor Primarchs have ascended to Daemon Prince status.Some of these were legitimate (Lorgar's faith in his father being shattered due to the Emperor's destruction of the crown jewel of his work and falling prey to Chaos in his moment of weakness Angron losing all of his friends and comrades when the Emperor refused to help them take their world and only saved Angron when he could save Angron's army as well) while others were blown out of proportion or misled completely (Horus tricked into believing the Emperor intended to rule humanity as a god Magnus being played like a fiddle by Tzeentch). Calling the Old Man Out: Most of the Traitor Primarchs turned due to actions that the Emperor or their loyalist brothers did to them that they never forgave.Broken Ace: While most of the Primarchs were this, the traitors took it Up to Eleven, as it was their very nature as broken beings that led to their corruption.