People are in Hogwarts, What the hell is the flood system?

In the wizarding world, magic only erupts when one is about to turn eleven. Rhine was ready to lie down when he just received the Hogwarts admission letter, until...[Congratulations to the host for joining the Chan Sect, the Honghuang human connection system is officially bound]Rhine: "This is Harry Potter, system, are you crazy?"[Main quest: Make friends, participate in the Battle of the Gods and survive]Rhine: "I repeat, this is Harry Potter. I'm going to take my head to participate in the Conferred God Battle?"[In front of you is Yuan Hong, the leader of the Seven Monsters of Meishan. He is a natural species, more than eight feet tall, holding a water and fire stick.][Make friends with Yuan Hong to gain the talent - Iron Skin and Iron Bones.] Invulnerable to swords and guns, immune to water and fire, and can extend your life by a hundred years. 】Rhine fell silent as he looked at the half-blood giant Hagrid in front of him."Okay, this is the primitive world, right?""I just want to ask, are you authentic?"