Obviously, there was no way in hell Killian would tell her any of these. Her death as a mortal human was the price of his arrogance and it would forever remind him that he had failed her yet again. Something within him snapped when he saw Iris in that horrible state and he never wanted to see her like that again.
If it wasn't for the need to assure her, Killian wouldn't have shown himself to her tonight. The guilt was eating him inside and whenever he looked at Iris's face, it only reminded him of his failures.
The other guardians thought that he was the closest to the Black Mage when Arman was still alive, but none of them knew how Killian hated the magi for fucking up his mind during their first encounter.
Arman knew that he was the incarnation of the previous God of the Underworld, so he embedded a soul shard with Hel's memories. It caused him to develop an identity crisis, wondering whether he was being tricked by the Black Mage at all.
