Erthenia

And because it's inside the stomach of the burning Hydra, Sith'Al loses its vulnerability to fire and its aura of cold.

It would be funny if Sith'Al, on the contrary, gained some kind of fire aura and became a fiery Yan'shi.)
-- A strong beast! -- During the battle, Yudeirn could clearly see that the hydra was being burned, hit, and frozen from the other side, and now he approached and saw those who were doing it directly.
-- Did you do that to her?