A mysterious and malevolent creature has appeared on Solitary Isle. Besting it will not be easy, but it must be done!
This errand is available after completing the main story.
Your target is on Solitary Isle, so Travel to The Fairyground, then fly Tengri to your southwest, having him drop you off to take on the Ionic Collum. As with the fight against the Prince of Whales, get your Bluster Blades and Storm-inflicting equipment out while having your Drongo-based familiar blast away. He has pretty high defenses, so it may take a while to take him down. Just be sure to stay healed as the battle goes on.
Defeat it and you'll complete the bounty hunt, return to the Swift Solutions to claim your reward.