"I already tried storing a Spirit Crystal inside my pocket dimension and using it at a later time. The moment you take the Spirit Crystal out, the sudden flood of world energy turns it back into a white crystal, ruining your work." Lith replied.
"What?" The Skoll said in amazement.
"He's right." Faluel said. "To create a Spirit Crystal, you have to use your mana to perfectly insulate it from the world energy. The power of our cores is abysmal compared to the world energy surrounding us.
"While a Spirit Crystal is inside a dimensional amulet, the void keeps it stable, but once outside, the world energy enters it faster than you can insulate it."
"Why not create the Spirit Crystal, turn it into a memory crystal, store it, and then imbue it with Spirit Magic again?" Tista asked. "With your Spirit Eye it wouldn't take you long and you could rest."