Mu You pulled the card out of the clutter in the shipping container.
The card was wrapped in a special material resembling plastic laminate, leaving the energy inside almost entirely intact. That was how it had been preserved so well.
As for the card itself, it was merely an ordinary Lightning Ball Spell.
Only Secret Art Practitioners could make and use Secret Art Cards, so this card could only have been left by Taurus or Gemini.
As for which one, a simple test would tell.
Mu You took a deck of Tarot Cards from his ring and spread them with his hand. All the cards floated up together, whirling rapidly before him and linking end to end to form a circular formation.
He placed the Secret Art Card in the center of the circular Magic Circle, where it floated on its own just like the other cards.
A moment later, three cards broke away from the formation in succession, converging at its center and overlapping as they spun rapidly.
This was an auxiliary Divination formation Vivian had demonstrated when he first began studying Divination. It could greatly increase both its range and accuracy.
Back then, he could only watch the spectacle. He could not even understand the divinatory signs.
Now, however, he had inherited Linglong's memories in full.
During her four thousand years in the Bitter Garden, Linglong had never neglected her Divination practice, even if she was not as diligent as the Herbalist. After four thousand years, however poor her foundations might have been, she had already reached an extremely high standard.
After spinning in the air for a minute or two, the card formation slowly stopped. In that brief interval, Mu You had already deciphered its meaning.
As expected, this Secret Art Card had indeed been made by