Perhaps Wraithstrike overlooked the top right of page 49 in the Rivers Run Red adventure...
Quest: Hunting the Beast
The PCs must track down the owlbear and destroy it.
Source: No one assigns the PCs this quest—the
owlbear’s attack on town should spur them into action.
Task: Slay the enormous owlbear at area V6!
Completion: Either one month after the owlbear’s
defeat (when it becomes obvious that the peril is no more)
or immediately upon displaying physical proof of the
monster’s defeat in public (such as its head or a claw), the
PCs’ kingdom gains the quest reward.
Reward: The destruction of the owlbear brings no
additional monetary gain apart from treasure looted from
its den, but the feat bolsters the kingdom’s morale, the
PCs’ fame, and the safety of all. Increase Economy, Loyalty,
and Stability by 4, and reduce Unrest to 0.
Hope this helps