Damnatory Knowledge
From Dawn of Corruption Wiki
In-Game Description
Kanathar has learned about the location of The Black Sun.
How to Unlock
Spread forbidden knowledge to your master.
While serving Kanathar, explore Nyx's realm and come back to him after. Yopu can then share some info about what you've seen, triggering this achievement.
Stat Changes
Arousal Gain + 5
Essense Multiplier + 20%