1000 page of Grimoire

There is a very popular fairy tale in this world that, ten thousand years ago, there were magicians. At that time, there was one such magician whose Grimoire had one thousand pages, and his name was David Vernon. This one thousand-page Grimoire held a secret: anyone who desired it could travel to another universe. When the other magicians learned about this, they came to him and asked him to use this magic, but he couldn't because he had spent his life on his research and didn't have the mana to perform the magic. Then they asked David for his Grimoire, but he refused to give it to them. There were two ways to obtain the Grimoire or its magic. The first was that the owner of the Grimoire could give his magic willingly, or second, if the owner of the Grimoire was killed, one of his magic pages would be obtained. Now, just as everyone was about to kill David, David tore his Grimoire's thousand pages and scattered them across a thousand places in the World. And by collecting these one thousand pages, one would be able to go to another universe. Adi will be the avenger who collects the pages of this Grimoire.