The Forbidden Curse is both a familiar and an unfamiliar term.
It's familiar because anyone with slight knowledge about the modern history of wizards will have heard about this term, and heard about its terrifying and unsolvable power. They would have heard that this spell has prevented a new world war from breaking out between wizards and demons. According to Zheng Qing, Forbidden Curse can be considered as the 'nuclear weapon' of the wizard's world, maintaining a terrifying balance in this world full of adversity.
It is unfamiliar because most wizards' understanding of the Forbidden Curse is limited to 'hearing.' Even the young wizards studying at the world's foremost university of magic only derive a faint impression of the power of this spell from the professors' lectures. There are hardly any detailed information about the Forbidden Curse in most public facilities such as the school's library and laboratories.
