Hzznakh was sent down to the armory to fetch his armor, but there, by the runeforge Arthas stood waiting. "Mylord, what are you doing down here?" Hzznakh asked. "I'm training you as a death knight, fetch your weapons and armor and return to me. Obey!" Hzznakh could do nothing but obey, his body and mind was overruled by the Lich king's will, he was losing control of his own mind, he felt his will failing.
When he had retrieved the the Trident and the armor, made to fit him so perfect that he could move unhampered in any movement, he returned to Arthas for his new task. "I want you to etch in the runes that are dominating your mind at this moment, those are your soulrunes. They are the runes that defines your magical ability, try to fetch them." Arthas instructed him. Hzznakh knew somehow excactly what to do, he went over to the runeforge and sat down, concentrating for a moment, then etching in the runes appearing inside his head on the side of the trident.