Parasite

"What do you mean by sick?"

Knight frowned because he was thinking that in a few days, the dark aura inside him would disappear.

"I'm a dragon Knight, I can sense things, now I'm sensing something inside you, something dark and evil"

Hearing Reghys Knight sighed and decided to tell her everything that happened with Aathreya as well as how they survived.

After listening to Knight, Reghys slowly nodded.

"That explains why the aura is strong in both of you"

"What about Arrora and grey?"

"They are fine, I can barely sense the aura, but Don, the aura inside you is growing, we need to check your body this instance, and I won't take no for answer, your wellbeing is the most important thing for this kingdom"

The black aura inside him was stopping his battle energy from circulating inside his body hence, he became weak. And he realized that if he stayed in this state, it would put all that he achieved till now in danger.