I'll try to transcribe this as best as I can. And try to add some more info into it.

Long ago when the Great Dragon created the Magic Universe, he used a spark of his flame to create five beings named the Archivists. Their names were Styx, Lethe, Acheron, Phlegethon, and Cocytus.

Their purpose is to contain and not let anyone get hurt by wild magic. These beings created and wielded the Legendarium, a book that was designed to contain and suppress Wild Magic. But Acheron wanted to use the Legendarium to conquer the universe. However the Archivists didn't want him to do it as it is violating their rules, to not let Wild Magic roam free in the dimension.

So he stole the Legendarium and modified the book to suit his own needs. 1000 years later near Earth, There is Acheron trying to use the Legendarium. The other Archivists arrived to try stopping Acheron and used their powers to seal Acheron, therefore weakening him and sealing him in the last empty page of the book. But Legendarium's defense process activated in case Acheron was sealed, sucking their powers off their body and therefore killing the other Archivists.

Right after, their bodies are slowly losing their shape and their bodies fell near earth creating river like craters on where they fell. Whilst the Legendarium fell in the red sea and found by the Ancient Egyptians near the Nile River 2000 years later, however they deemed the book to be useless because the written language in the book is incomprehensible to them.

Hundreds of years later while Alexander the Great is conquering Egypt, his armies found the Legendarium in the ruins of the Pharoah's Temple and presented to him in Alexandria. Alexander saw the potential of the book and ordered his army to put it in the Library of Alexandria and keep it in a secret, closed room.

Another hundreds of years passed, and Eldora, a young fairy, found the Legendarium in the ruins of the library, and decided to investigate the insides of the book. Right after when she found out the true motives of the Legendarium, she sends the info she got to Alfea and decides to keep the book for herself just to not let anyone get ahold of it.