Advent Loyalists! Moar destructive psionic powers!
[Provided they are the faction that holds true to their revenge against the TEC.]
EDIT: Definitely Advent Loyalists.
For the first time in their history, the war creates a schism in the Advent Unity. The loyalists seek to continue their policy of revenge against the Traders, and to assimilate all others to the Unity’s influence. However, others amongst the Advent suspect that a corrupting influence from within has diverted the Unity from its proper destiny.