Astonishia Story

Defeating the White Dragon:
First beat Brimhild, then you will fight against the White Dragon. To
defeat the White Dragon, you need lots of Magic Potions and Grilled Eels
(30 each recommended if Ylenne is over level 20).

While fighting try to stay out of his meteor attack's range. When the White
dragon does not move, stay outside it. Line Ylenne up on a straight line
with the White dragon, go to little closer to him, then attack him with
Ylenne's Hell Fire attack. (You need in range to damage the dragon.)
If you need, use your other heroes to refeill her MP. In this case
Ylenne can use Hell Fire attack repeatedly.