"Oh? What's good for me to fight a monster that I have already defeated before?" Jack asked.
"If it is a common monster, of course, there is no point. But what if it is a rare monster that is difficult to find? And you happen to need a specific material that is only dropped by that exact rare monster? It will be a hassle to go around searching for that monster. But by using the monster chamber function in this guild, you can fight that monster unlimited times providing that you are willing to pay. Hence, getting said rare materials will not be as difficult as gaining it via the normal means."
"I see, that was indeed good."
"Yes, go out there and record as many monsters as possible. And try to get all the rest of those monster books too."
"You said it like it is an easy task. I might need a long time to collect sufficient challenge points," Jack uttered.