Kain stayed silent through Zefiris and Dorian's discussion, knowing that Zefiris didn't know anything about Dorian's past. While Kain himself didn't know much about the mummy, he knew enough to guess why he felt the way he did about death.
Kain's grin faltered slightly at Zefiris's answer. He didn't fully understand some of what she said, but he got the point. He was slightly irritated that he had no idea what she was capable of. And there was that word, again. "What exactly is a D-Knight?" He asked. Whatever it was, it seemed to be tied to her ability to fight.
With a glance at Dorian, Kain shook his head and chuckled. "I don't think Zefiris has seen your other forms yet, Dorian. Maybe you should show her."
At the very least, it would show Zefiris what Kain had meant about Dorian's interesting fighting abilities.