Mia hasn't heard of the robot joining VIGIL because he hasn't joined VIGIL.

"TARBot. And when it comes to my passion, I never take 'no' for an answer. Now..."

Wait. Deus Mechanicus? As in, machine deity? This sounds interesting.

TARBot quits hovering and puts his feet on to the ground. He leans over, placing his hands on the butt of his sword like it's a cane.

"Hm. Tell me more about this 'Deus Mechanicus', and their connection to your sword."