The Kingslayer's Shadow is a Sworn Sword Quest that is part of the Flayed Man's Gift storyline.
The Kingslayer's Shadow
"My [lady/lord], we must keep close watch on the Kingslayer and the Boltons this time, lest another incident occurs. We should send a sword at once."
All Alignment Quests
Whichever option you select, the following Sworn Sword Quest will activate:
[Your Sworn Sword] manages to stay close to the Boltons for several days. Jaime Lannister is treated well, and the party encounters no trouble on the Kingsroad.
Enter the text upon failure of the quest
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|Dead Man Walking||-||The Flayed Man's Gift - II||-||A Maiden's Worth|