"Impressive, keep up the good work." Ryker complimented his Demon Monsters.
Currently, he had changed something regarding the working of the Lair. Namely, he allowed his monsters to battle one another.
Those from Fiend Race that is, and only the weaker ones. Those truly powerful like Ogres and Trolls does not need to prove their spot, but regular Demon Goblins and Demon Orcs need it in order to evolve.
Yes, he force them to battle in order to make them stronger, or at least the survivors stronger. Only those that manage to do so would be allow to live in the system space.
Those that did not, will either die or if they manage to stay alive will be thrown out to Lunis Forest in order to make more Demon Goblins or for them to survive in the less challenging arena and thrive there.