Ruknakurii, the Acid Tear Dragon:

A dragon, born of the will of Kettoss and placed in the care of a mage whose heart was involuntarily cursed, was so upset, he overwhelmed the world with acid tears. Rejected by his guardian, unable to contact his father, he pushed away all those who tried to approach him. His tears, made acidic by rage, melted away the scales on his cheeks. As they rolled down his face, they flooded the world, destroying it. Ruknakurii means “he who dies of sorrow”.