Storage Box
The restriction that was imposed by the academy was something hard to accept for Emery and the others. This was the most disadvantageous thing an acolyte from the lower world would be facing.
When Emery, Klea, Julian, Chumo and Thrax finished their second year in the academy, this time there would be a break period of 3 years. It meant they had to stay on Earth during that period of time before they could go for their third year.
During those 3 years, all acolytes would try their best to increase their cultivation. Even though they didn't really need an item or artifact to improve, it would still be very beneficial to have some leverage of sorts against others.
For Emery, all the top magus, even the headmaster himself, thought his Dark Core would be the bane on his road to becoming a magus. Therefore, his future to be a magus laid in the hands of Kilgraga and the Khaos Space. So, it was crucial for him to bring the item that the dragon needed back home.