Book 2 "Showdown" - Where is the Ghost Key?

[Davzz]

I can't remember where the Ghost Key to open the final door is.

[muaddib]

there are 2  in total that drop, if memory serves,the first 1 drops by 1 of the zande heroes at the various portal before facing copy shizuka-transporting areas, the second drops by a priestess of flame after fake shizuka event.
best of luck