The Bone Witch

Turn in 1 and then accept 2

When completed quest 2, you can get "Vrykul Bone" and use it to exchange buff items with the Bone Witch.Turn in quest 2 and then accept 4.Go into the Underhalls, you can accept quest 3 from Bethod Feigr.

Turn in quest 3 and then do quest 4.

Apprentice Osterkilgr, mob of quest 3, will drop a book called "Dr.Terrible", which will activate quest 5.

Turn in 4.5, and then accept 6.

5-person-team quest, two players could try to do it. This is an optional quest.

5-person-team quest, optional.

The following 6 quests are 5-person-team quest,, which is optional.

You can skip those 5-person-team quests, just go to the next stop Death's Rise.