Major characters in the Warhammer 40k setting, the Primarchs were 20 beings created from scratch by the Emperor of Mankind and whose genes would be used as the basis for the biological modifications given to each legion of Space Marines. Many would die or vanish following the treason of one of their own, Horus, and the subsequent civil war. Meanwhile, Robute Guilliman, Primarch of the Ultramarines, would return to the setting and become one of its principal characters.
List of primarchs.
Note Alpharius Omegon was split into "demi primarchs" Alpharius and Omegon. In universe the II'th and XI'th Legion were censured for unknown reasons with some fans creating their own concepts. Fan made interpretations are Lost Primarchs.
