I LOVE most of this codex all though I cannot lie about missing the 155 point Avatar
I found some errors or issues that need to be addressed and I will work backwards from the Autarch rules section to the beginning of the "dex"
Autarch powers were great but the "shadows and dust" , I feel, needs to be stated if the moving player is allowed to reposition the facing of the vehicle as this could easily break this rule
imho
Vehicle armory: Repulsor Fields are useless as no enemy models may remain in "base contact" with the vehicle after the assault phase assuming the vehicle survives. I would change it to a flat distance or a d3 inches distance for the effect.
Eldar Runes: A nitpick perhaps, but did you intend to switch the effects of Runes of Warding with Runes of witnessing?
Fanboyish Suggestion for Fuegan: Fire axe is now only plus 1
str, and now confers the ability for fuegan to project his psychic might through it with the same profile as the dragons breath flamer. I say this because I hate how firedragons still seem like nothing but melta carriers when they could be so much more (especially with your awesome addition of the crystalline dragons unit. I think Fuegan should be able to hang with either unit and either contribute via synchronicity or compliment.
This is really all I could find that was something I felt compelled to comment on. GREAT work Just dave... I hate you for making such great codexes that will never be tourny legal