Basically this expansion idea is simply a way to resurrect dead NPCs... but it won't come cheaply or easily.

What I would like to see is a nice expansion dedicated to Ark'ay... a series of dungeons and questlines that, after completing them, would allow you to do medium-sized repeatable quests/pay money to resurrect dead NPCs.
It would start at the temple of Ark'ay in Falkreath - where the story starts spinning about a visiting powerful priest of Ark'ay from another land... that priest then sends you to collect various items from new dungeons and events - explaining his/her story and some of Ark'ay's history.
After the primary expansion questline is over... you would get a repeatable questline where you can select any one individual dead NPC you would like to have resurected. You would have to pay an upfront fee for "provisions" (say, a 1000 gold) and then would be required to get some specific piece/item. After said acquisition of item - you ultimately would have to go to some new shrine of Ark'ay buried deep within some new ruins. At the altar, the corpse of who you wanted to resurrect would be there - along with the priest. After they're resurrected - the entire dungeon is filled with enemy ghosts - the story being that the ghosts are trying to keep that person's soul from escaping. Finally you would have to escort that person safely out of the dungeon THROUGH those ghosts in order to rescue them (think like a companion's kidnapping rescue questline)
This would be a neat way to bring in a much requested way to ressurect your NPCs, while not only turning it into viable content, but also making the quest/chore/finances long enough to provide a true/RPG sense of serious consequences involved in the cheating of death and truely resurrecting anybody to pure consciousness.
What say you all?

escort mission!