Invisible dreadnaught assassin who tried to stab Carl in the back and got his face punched off instead.
While Carl watches the cyborg battle from the roof of The Barracks, Princess Donut screams a warning about something invisible behind him. Carl spins and punches, his bare fist smacking an armored chest; the creature grunts "Oof" and a glowing dagger spins away. A second punch makes an outline stutter into visibility — another Dreadnaught, clutching his chest, apparently astonished at how hard Carl hits. The name reads J IronFjord.
Carl rips off his faceless mask, and it sails away like a frisbee. They go down together on the roof, Carl on top, and he punches over and over until IronFjord no longer has a face. The onlooking summoned totem 1970's Death Cult Leader mutters that it's really nasty, and The Scavenger's Daughter announces she has been fed.
A heavy, armored figure hidden by a sparking invisibility cloak, wearing a strange faceless mask, wielding a glowing dagger — until both mask and face were destroyed.
Second dreadnaught infiltrator sent to assassinate Carl during the barracks fight.