Sea of Tears

Once upon a time, in Ragna Empire, lived a son called Sabathran and his mother Rahmiel. They lived in poverty and plague, his mother was infected by Black Blood, a disease impossible to cure. Sabathran was struggling to cure her mother, but his struggle were all in vain. Only a drop of Dragon's Tear could cure his mother.



Hence, this question arose; "How can you make a dragon cry?"