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Not much info on the Advent though but I am liking this<3
"The Advent are very culture-based, so their Titans have nice curves, not sharp angles, and they use their psionic abilities to the utmost. So for instance, if you were playing with one of the Advent Titans, you have an opportunity to mind-control enemy ships, or take over enemy planets simply with your psionic power."

Also as a way to expand upon the difference against the factions any idea what some of them are. I think for the most part most are covered but the advent.
TEC REBEL: Defense
TEC LOYALIST: Offense
ADVENT REBEL: Not really clear but perhaps a more peaceful approach? "However, others amongst the Advent suspect that a corrupting influence from within has diverted the Unity from its proper destiny."
ADVENT LOYALIST: Offense - its implied in the lore section "Loyalists seek to continue their policy of revenge against the Traders, and to assimilate all others to the Unity’s influence."
VASARI REBEL: Diplomacy
VASARI LOYALIST: Offense - Perhaps mobility it seems to imply that they are packing up and leaving, perhaps their titan becomes their Homeworld.