The Duke saw the expressions and faces of everyone as they were enamored by a miracle that would change the lives of many. He knew he could not convince everyone that this was a trick! He, himself, couldn't believe it!
Capturing monsters and bringing back their corpses was a job for professional hunters and corpse trappers. With monsters grouping together, it would take a team of nearly a hundred men to bring back monsters that could be used for level-ups. This is why most nobles do not bestow experience to their slaves. It was a costly investment to have one level up.
But if it were magic ores, it would be a different story. People can invest in these at low levels to boost the warriors so they can venture out and fight the monsters at their higher levels.
Those of noble backgrounds could have servants that would be level 3 or 4. It would also be useful for their vassals to grow in power like this as a safe option is allowed.
