The Amazing Obscure Quest Description Guessing Game!

No, not Memory Paranoia, though they are similar in some ways.
Okay this hint might just give the quest away, but

Spoiler: Enter at your own risk

this quest is extremely dark, and is the only quest that affected me so much I nearly couldn’t sleep because my mind kept drifting back to it. Imo the darkest quest <= lvl 99

 

Oh geez... uhhh, could it be Hollow Serenity? Lotta dark themes and sorrow there.

 

The only quest I think of for the spoiler hint is The Canary Calls. I don't know how that connects to "Bastard Children 1: Murder is Fun." Could it be those papers I never bothered to find?

 

I was gonna make a new hint like in version whatever, this quest replaced an older quest with similar names, but completely different plots! It is indeed Hollow Serenity.
Eileen is the bastard child (given she was sired by Garvan and not Yorman). And there's murder (Katarin is murdered, we eventually murder Garvan, Eileen is murdered by Garvan accidentlish, Katarin might murder the whole town depending on your choice.) It's a dark quest, and its similar to Memory Paranoia in that they are 2 of the derelict mansion quests.

 

oh i totally forgot abt Eileen, woops!