having trouble with this one... QQ i managed to find http://bdocodex.com/jp/npc/35669/ and than when it gave me riddle i found first clue on top of tower in middle right on this pic https://gyazo.com/5f8add12ea8a2ac3725800f915cc47b2

im still having trouble locating sacred pinnacle if anyone has any idea pls post it here

I had some struggles with this questline as well, so I'll post some hopefully helping screenshots! The investigate point you need to find is in the "mothers heart", which is the great tree Kamasylve. Just go up the stair and look out over the city between the branches, and it should be right there.

Next part of this quest is in the tower you can see in a distance, you need to go there and interact with the books up top.

https://imgur.com/a/jPkhn

https://imgur.com/a/d5ggh

Had to zoom in all the way and rotate around a bit to get the sacred pinnacles knowledge while investigating the tree.

Nice, people posting screens without at least a minimap :S guys, photos of beautiful sceneries without UI dont help database articles much!
Here are spots for this quest:

Sacred Pinnacle: Go up into kamasylvia tree, on right observation mark. Interact, you will get typical observe controls zoom up down etc. turn to see kamasylvia tree, zoom in as far as possible and mission completes.

Position in Tower

-----------------------------------------------------------------------------------------------
Position in Tree