Thadus needs for me now to try to find the satchel containing notes regarding the location of the snowflake limestone quarry. It is likely that one of the undead has it, so I should kill the Briarstone skeletons in the hopes of finding it on one of them. Most likely the leader of the undead, Taril V'lenial, has taken it from any of his minions who might have picked it up. If I find it, I should return it to Thadus.