I'm not sure if any you found this but if you haven't. The dead ghost us easily found bia the tunnel you go through at the end beforr heading towards malok. Its at the exit of the tunnel inside by the right, just there on the side.
[b]Hope this was any help[/b]
Edit 1: The ghost is not new, there are 4 in the area. Most likely about the traveler and such. But for all you Y2 players. Check put below for some links to get that grimoire up if you so desire.
Heres the link [spoiler] https://youtu.be/vpoOebDKSPI [/spoiler]
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Someone else brought this one up and I looked for it but then realized I picked it up a year and a half ago.