I like the feel of this place - it even calls to mind some of the Game of Thrones locales, though the inhabitants are far more hospitable. I see this area being a critical pass between populous regions.
A good place to stage a murder mystery, plague, Alienseque monster invasion, etc.
Good trap, though things like 'no escape' bother me. All illusions, the product of fallible mortals, can be broken with sufficent spellpower or other attributes/resources. Extremely Difficult, yes. Impossible - no. Go to Comment
The main thought I had with this item, is why would the undead necessarily seek vengeance? If the figure was evil enough in life, the undead may willingly follow them, or bear no animosity (beyond the normal undead hatred). However, if the undead were created through his actions, or were ordered to do things they would not have willingly done otherwise, then I could easily see vengeance being sought. Go to Comment