Lucius

All Adeptus Mechanicus units change their [Forge World] keyword to Lucius. All units with the Lucius Keyword gain the Allegiance: Lucius special rule. The Allegiance: Lucius special rule consists of the following rules:

• Lucius Pattern Solar Armour: Lucius units in your army gain a 6+ Invulnerable save. If they already have an Invulnerable save, this is increased by 1 to a max of 4+.
• Jealous Secrets: You may not include any allies or Allied detachment if your army is Lucius.