Editing MidHammer 40,000 (section)

===Roboute Guilliman===
Roboute Guilliman and the [[Ultramarines]] have become the go-to force for minor insurrections and problems around the Imperium's eastern fringes. Due to their facilities and many recruiting worlds they are the largest of the Astartes forces, but due to Guilliman having to work through literal mountains of paperwork and council often with the Warmaster, the King Of [[Macragge]] had to write the Codex Ultra, a Chapter-specific guide to how the Ultramarines should be run whenever their Primarch was unavailable, although he has made several thousand addenda and changes to it since he first wrote it just a few centuries after the [[Horus Heresy]].

Guilliman brought overwhelming force against the T'au, which they barely countered with clever tactics and highly-advanced technology. When he then brought the full weight of [[Ultramar]] against them, they realized that no tactics were clever enough and no technology advanced enough to allow them to stand against the Imperium indefinitely. Thus, they became reluctant Imperial vassals. Guilliman is seeking ways to integrate T'au technology into the Imperium.  He knows that he must tread very carefully in this endeavor and does not expect it to achieve any significant success for centuries:  The Ethereals are resistant to accepting humans as their superiors.