Iron Mother Directix and her floaty balls of DOOM! Again, I don't know too much about how she plays since I haven't played her yet. I know that she leans toward lists with more servitor models and the Prime Axiom colossal. And she has floaty balls of doom and that's just cool. Her exponent servitors give you a +2 on damage rolls against their target for a round and that's nothing to sneeze at.
I have to say, I love this model. Where as Syntherion is simple and lacking detail, she has it in spades. Her and Aurora took me longer to paint than any of the other convergence models I have. Can't wait to get rich so I can run a couple of those colossals lol.