first follow directions in the comment to this article - http://bdocodex.com/th/theme/6394/
this particular knowledge is obtained in the next quest, same name as this knowledge.
u can find item in the place as seen on my screenshot

This quest - http://bdocodex.com/th/quest/6606/6/
also asks for 2 other things to find, u get them both at this spot

Can be obtained by interaction outside of the broken questline - Unsung Hero can't be accepted after the Kama main quest was changed.

You can follow the questline guide made by the other guy in order to find the interaction points:
https://imgur.com/gallery/Co4t1

Bu bilgiyi aldıktan sonra almayı deneyin https://bdocodex.com/th/theme/6394/

First, obtain the knowledge "Record of the Moon's Darkness"

Сначала получаете знание о летописи лунной тьмы (https://bdocodex.com/th/theme/6394/), потом идете за этим знанием.
Никаких квестов не нужно