He's a monster that has been locked in the Helmet of Braccus Rex, full name is Krylr the Kettlegrinder. Use the helmets abilty Source Vapirism 5 times and he will appear. He has some dialogue, but I dont think theres a way not to fight him, he seems to talk big, but he is not really strong so he was a little pointless of a mob, I hope they use him for more than just that. I did it when I only had the helmet equipped and the helmet did get better stats. If someone as a saved game with the full gear and didnt trigger him yet, I hope you could test this theory.