The previous Princess Melloblum had exhausted herself for her people’s happiness, a sacrifice that haunted the former First Lethal Thorn with guilt. So it trained its apprentice to become the perfect guardian: one who could detect and eliminate any danger to the princess without hesitation. But years later, it realized its mistake. "Thorns hardened by tears grow unyielding, yet lose their scent." A First Lethal Thorn that knew nothing of joy could only bring sorrow to those it sought to protect.