Fear of retaliation

Despite the assurance Lady Victoria had received from him, she was still nervous, as she explained quietly, "Since that incident, the Moon Kingdom has been in fear of retaliation from witches."

Fear of retaliation? That could only mean the Moon Kingdom had kidnapped and burnt a witch alive to use as a potion for their king, his grandfather. 

It repulsed him just thinking about it. 

"At one time, there was tension in the Moon Kingdom. This was many years ago when I was still a little girl. But... I heard my father talking about it with my mother. It seemed the witch clan found out what the Moon Kingdom had done to their kind."

"Even if our kind is strong for war, there are so many ways we cannot beat the witch clan. Especially a witch clan prepared for war even though they were smaller in number and not as organised as our kind."