Pantheons Witness The Lightning Thief.

The Greco-Roman, Egyptian, and Norse Pantheon are meeting on Olympus for peace treaty between Pantheons with some of their greatest champions joining, when all of a sudden, Mnemosyne comes in with a chest of books, stating she was tasked with converting the memories of the heroes present into books so that the three Pantheons could get to know one another better, by the Deities presiding over fate in the three Pantheons.