If you were asked who the “main character” of the Horus Heresy story is, you’d be hard-pressed to find an answer that could cover the 50+ novels of the Horus Heresy story. It is, after all, so incredibly vast and covering so many different characters that there’s no real way to say that one character is the main one in all of the stories. Some might say Horus since this is all titled after him. Some would say that it is the Emperor since all of the heresy’s conflict is done in support of or in spite of his dream for humanity. For me, I choose Garviel Loken.