Master Terry:
Let's start with one living close to this town. I guess that narrows it down to Neer Ghoul Berserker. If you go to the east execution ground, you'll be able to find many neer crawlers. Among them there will be one called Neer Ghoul Berserker. Catch him.
And once you get hold of him, see if you can find anything extraordinary. If there is anything at all, come back to me right away.