You can now head off to the Talys Highroad side of Fort Gandala where Celsius reveals who the first human she ever met was. You might remember him.
Why this turns into a fight, I do not know. Why can’t Celsius just be like… okay let’s work together and then give us her power.
Boss: Celsius (2) & Aqua Dragon (Enslaved)
Weakness: Fire, Slash (Celsius)
Celsius and the Aqua Dragon are not so deadly apart, but together they form a deadly pair with their status ailments. You should focus on getting one down while the avoiding the other. The easiest way to do this and stay alive is use ranged attacks, like the dual pistols, against the Aqua Dragon, who does not have a strength against the weapons. Stick to fire-based artes, since both Celsius and the Dragon are weak to fire and once the Aqua Dragon is down you should have no problem dealing with Celsius.
After the fight the Aqua Dragon will still be active and a cute scene will occur before Celsius uses up her remaining mana and is gone.
With Jude’s brain obviously having the key and Milla’s concern for his well-being on everyone’s mind, head to Sharilton and make your way to the Lord’s Manor for a funny scene and a breakthrough in the Spyrite research.