As Nick left the underground city, he tried his best to focus on the task at hand.
He knew that Aria would die soon and that this was the last time he met her.
It hurt.
A lot of regret assaulted Nick.
'Regret for my own happiness is not important,' Nick thought. 'I was never destined to be happy. I was destined to sacrifice myself for humanity.'
'I'm sorry, Aria. I could've never made you happy.'
'If there is a next life, I hope you find someone better.'
Nick returned to the Containment Unit and resumed working with the Right Arm and the Inferno.
By now, both of them had become Mid Shields.
After all, while Nick benefitted from working with them, they also benefitted from working with him.
If the two sides could continue working forever, they could even reach the ninth level.
Sadly, time was limited.
After around 40 more years of work, Nick managed to become a Mid Adversary.