So I've been reading up the RPG lately to brush up on Thalassian elven lore. In it, Silvermoon City is abandoned, inhabited only by undead elven guardians and ghosts that wander the streets and towers to ensure that no more harm befalls their city. If Turtle WoW content ever reaches the high home of the elves, this could make for an interesting instance involving raiding the Sunstrider Palace in search of the hidden fortunes of the Sunstrider treasury."The Sunstrider Palace is where the Sunstriders, a family of high elven lords, ruled Quel'Thalas from. This majestic palace was once a marvel of organic elven architecture, but now its walls are stained with elven blood and its graceful spires shattered like bones. The Scourge, despite its best efforts, never discovered the legendary Sunstrider treasury. This mythic vault lures adventurers and fortune seekers from across the world. Sunstrider Spire is by no means safe, as hordes of elven ghosts and undead guardians stand vigil over the palace."
-Lands of Conflict, pg. 114
This instance would be thick in undead presence. It would mainly be undead with arcane guardian constructs and possibly a few humanoids. There could also be traps that need to be disabled by a rogue with Detect/Disarm Traps.
Possible boss ideas could include:
-A rival treasure hunting party that has made camp in one of the wings of the palace. Could be standard greedy adventurers who don't want to share and have offed rivals in the past, or they've gone crazy from isolation and think everything is an undead out to get them.
-Blood elves scavenging the place for anything of magical value to siphon from. They could just be independent, or also be trying to reclaim the palace or find something in particular that is held within for Kael'thas. Could be involved in a quest to find whatever it is they're looking for.
-The Captain of the Sunstrider Royal Guard, now an undead guardian.
-The ghosts of nobles, courtiers or servants, maybe?
-An arcane guardian that has either gone haywire or is still following its programming to protect the Sunstrider Palace vaults*.
*Not sure about this one because I don't really want to copy the Curator from Karazhan.