He knows that the creatures will return to the surface once again and more heroes will be needed. Derek Perkins narrates the rise of another hero in the later stages who is supposed to be cursed initially. A Warrior’s Redemption and Don’t Feed the Trolls are full of supernatural creatures and they are equally scary too.
So this is the strength of the author through which he decorates the stories all the time. The listeners also expect the introduction of such creatures at every level because they just love it. In the story, the hopes of the human race go down one by one and it all comes to an orphan who can save the day eventually.