I apologize if anyone is put off by the tone of my post. I'm aware that the designers wanted to make spirits more unique and interesting than previously.
For example, it isn't bothering me that nymphs and such aren't in the book. The rules for nature spirits give you all you need to put dryads etc. into the game and keep them interesting, powerful and special.
I am only expressing a degree of surprise and disappointment that the same wasn't done for the spirits of the dead; given that this is an adventure game, tombs and barrows and unquiet spirits are going to be met with. How about some guidelines from Mongoose?