An army that includes a model with this special rule may take a single Castellax Battle-automata Maniple or a single Vorax Battle-automata Maniple as part of the same Force Organisation choice as the model with this special rule. Any models in the Castellax Battle-automata Maniple or Vorax Battle-automata Maniple included in an army due to this special rule gain the same Legiones Astartes (X) special as the Legion Praevian they share a Force Organization choice with, but may not select any Legion specific Wargear or other options.
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