A black orb has appeared near the Whispering Waterfalls, sending the local wildlife into a frenzy. Go and investigate!
This bounty is available to complete after beginning Errand 131.
As with the Guardian of the Woods, make sure to defend whenever he's about to use Windfall, then barrage him and go for the gold glim to make him pay. In the meantime, normal attacks from your familiars will do fine. Make sure to keep an eye on your HP though, as his attacks are actually pretty strong. He shouldn't give you much trouble... he's too slow.
Defeat it and you'll complete the bounty hunt, return to the Swift Solutions to claim your reward.