There are several mounts you can find throughout your time in Final Fantasy XIV. Some appear for a limited time during special events, and others are always available as long as you’re willing to test your skills in dungeons and trials. The Boreas Whistle for summoning the mount Aithon is one of them. In this guide we will tell you how to get the Boreas whistle for the Aithon mount in Final Fantasy XIV.
You can only get the Boreas Whistle by completing The Bowl of Embers (Extreme) trial version. There you will fight Ifrit and you must defeat her. If you do, there is a chance the Boreas Whistle will drop at the end of the dungeon and you can earn the Aithon mount. You’ll also face off against the other players who took the Trial with you, which means that if they outperform you on loot rolls, you’ll have to retry The Bowl of Embers (Extreme) Trial.
You can unlock The Bowl of Embers Trial by reaching the Lord of the Inferno quest, which takes place during the Umbral Seventh Era main scenario quests. Upon completing the Lord of Inferno quest, you will unlock The Bowl of Embers Trial. After that, you’ll need to work your way through the side quests A Recurring Problem and Ifrit Bleeds, We Can Kill It. Finally, after completing the hard trial, you can complete the A Recurring Problem quest to unlock the extreme version, which will include the Boreas Whistle and the AIthon mount loot drops.
https://www.gamepur.com/guides/how-to-get-the-boreas-whistle-and-the-aithon-mount-in-final-fantasy-xiv How to get the Boreas pipe and Aithon mount in Final Fantasy XIV