Hogwarts: Star Generation

This is Hogwarts, 1991, and the savior Harry Potter is about to enter his first year. That same year, the world took a turn for the worse. First, the moon was annihilated by an octopus monster with yellow tentacles that annihilated 70% of the sphere. The resulting gravitational tide caused a tsunami in the Pacific Ocean strong enough to submerge two parts of the Americas. But the disaster did not destroy everything immediately. A bald monk who claimed to be the Supreme Mage and another golden helmet, yes, just one helmet, two white wizards [suspected, some scholars said that the helmet looked like a Horcrux in black magic]... In short, they suppressed the ocean. And in the midst of the serious breach of the "Secrecy Act" and the troublesome matters of how to repair the moon, a small question was raised. "There is a prophecy that in seven years, wizards will be exterminated..." "What kind of crappy third-rate fortune teller would tell such ridiculous and irresponsible lies?" "He said his name was Gertler Grindelwald."