The System's tone seemed melancholy, reminding William that this wasn't the only time it had suffered. Being with anyone for a long period of time would create an attachment, though not all of them were positive.
The Eighth Host, Efretta, was an example of a positive attachment, though her near-death most likely caused the System some trauma. On the other end, there was the Ninth Host, Ninover, whom the System had no choice but to contract with to save Efretta's life.
William didn't know the specifics of the second example, but Ninover definitely didn't treat the System well considering his status as an enemy.
You couldn't have killed her and left? You could've found a new Host. William asked.
-First off, I cannot actively try to kill my Host. Secondly, why would I actively weaken myself? No existence is invincible, not even Gods. I lived for Eons alongside Xonya, and I will say that there were no boring moments.