Taretha's Diversion and Escape from Durnholde have problems where they cant be completed. they need very extensive scripting and core support which doesnt exist. so I have created supplementary quests with NPC called Steve Blitz, you MUST get the quest from original NPC beforehand. once you get and finish the quest Taretha's Diversion supplement from steve blitz you will get 10 x Giant Shark Tooth which u can use with the newly expanded tradein command to finsh the original Taretha's Diversion quest. After that u can go get Escape from Durnholde and then Escape from Durnholde supplement and complete that. which will get you Escape from Durneholde Token which you can tradein and that will complete Escape from Durnholde for you.

basic idea : get regular quest, get supplementary quest, do supplementary quest, get reward and tradein, turnin original quest which was completed via tradein. move onto next set of quests.