* AlternateCharacterInterpretation: Several:
** Astelan presents an alternate interpretation of Lion El'Jonson in ''Angels of Darkness'', that he was not the loyal son he appeared to be, and instead deliberately delayed his approach to Terra to see who would win the Horus Heresy, the Emperor or Horus. This was pretty firmly entrenched until the ''Literature/HorusHeresy'' started, where it shows that Jonson was fanatically loyal to the Emperor, believing that it was better the Space Marine Legions destroy each other than risk overthrowing the Emperor.
** Cypher invokes this from one Segmentum to another. Is he the most vile and evil of the Fallen Angels, who is making his way to Terra in an attempt to kill the Emperor on the Golden Throne? Or is he the Fallen's only hope of redemption, instead trying to take the broken Lion Sword to the Emperor to be reforged and earn absolution in the Emperor's eyes? ''No one'' can seem to agree on it. ''Horus Heresy'' books show that he may have been the cause of Luther's fall to Chaos, while other books show him [[spoiler: helping Imperial Guard troops defend themselves. Even ''Angels of Darkness'' is wary on the subject, indicating that he only wanted the gene-seed and didn't take part in tampering with the annihilus. ''The Unforgiven'' confirms that while Cypher did steal the gene-seed, he didn't know about his comrades tampering with the annihilus or murdering the Aspirants. However, to add to the confusion, Luther's dialogue in ''The Unforgiven'' indicates that the Cypher of the Heresy ''is not the same Cypher'' that appears in ''The Unforgiven''.]]