A simple principle [1/2]

"I reiterate. Lizardkin, if we could find a way to give you the black smoke without needing to protect the undead. What would you do?" Bella repeated.

{I will help you kill the undead.}

Jo added as she threatened the Alpha's head with her bat. 

"You said you have plans to go deeper, right Alphy? Once the vampires are dead. What will you do next?"

{I will go deeper and fight the ones below.}

"Why?" Jo asked.

{Because if I do not, I will be enslaved again. I will only be free when I am stronger than what exists below.}

"..."

I see. So it was a vicious circle. The monsters below kicked the ones above to wage war against the humans. Since this lizardkin was weak by Hellsgate's standards, it had no choice but to try to evolve despite the risks.