Legiones Astartes (X)
(Rule)Description: Any unit with this special rule will have a number of additional special rules and abilities specific to their ‘named’ Legion, all of which will be defined in other Horus Heresy – Age of Darkness publications. A Space Marine unit may only have one such ‘named’ rule, e.g., Legiones Astartes (Sons of Horus). Space Marine units from a different Legion may only be included in an army using an Allied Detachment (see page 281) and in conjunction with the Allies in the Age of Darkness chart found on page 282.