Thórhall hopes to study the anatomy of gredbyg to learn more about them, so that they can be better combatted in the future.
'I should like to learn about these odious insects while you're working on driving them off. Will you do me a great favour, and bring me anything out of the ordinary that can be found on their anatomy?
'I hope that studying the gredbyg will give us better tools to fight them.'
Gredbyg can be found in a hive in the Palace of Náin.
You have been asked to collect anatomical items of interest from the gredbyg for study.
Thórhall is at the small dwarf-camp in Lamab-dûm in the Great Delving.
You should bring the scent-glands you have collected to Thórhall, so that he may study them.