Legio Astorum – The Warp Runners – is a Loyalist Titan Legion of the Collegia Titanica, one of the military arms of the Adeptus Mechanicus. The Legio Astorum is an ancient and honoured Legion based upon the Forge World of Lucius, located in the Segmentum Obscurus. This Titan Legion is suspected to have been founded before the Age of the Imperium, during the Age of Strife.
- Legio Gryphonicus – Leigh
- Legio Audax – Lis