A Matter of Principle

Journal
"You won't believe what's just happened! A real devil came to see the baron! No one knows what they talked about, but I sense that a new adventure is brewing..."

"For better or for worse, the Forefather, that devil, succeeded with his plan. - Now everyone knows Kanerah's and Kalikke's secret. This means Nethys's condition has been broken. The Forefather promised this isn't the end. What will happen next?"

Walkthrough

 * The Forefather - a devil, who appears to be a biological ancestor of Kanerah and Kalikke will come to you in the throne room and ask you to meet him at the Southern Barrens.
 * Go to the now-unlocked Southern Barrens right to the south from your Capital, across the Bridge over the Gudrin River with Kalikke in your party. If it is Kanerah - switch them on any location on the way.
 * After arriving to the location, you have a small chat with The Forefather. You find out, what kind of trap for the Soul Eater was prepared - to lure him into thinking, that he deals with Kanerah, while he was killing Kalikke's friend Sweet Teeth. Now you can: summon Kanerah to distract the Soul Eater (Chaotic Good option), let the Soul Eater eat Sweet Teeth (Lawful Evil option), but the best result (for both girls) is achieved by the Neutral option - good old combat.

After resolving the situation you get 720 xp, and another 270 xp after the talk with The Forefather.
 * Return to the Capital and talk to both girls - you recieve 900 xp and this quest is finished.