Ghost Castle had been established back in Olivia's era. At first, it was a demiplane where Olivia housed vast numbers of ghost Cat Lamps. But after a group of powerful Ghost Witches moved in, the constant expansions, endless excavations, and the major discovery of Ghost Castle's gigantic folded space gave this faction a power and status that could not be ignored.
This was the homeland of the Ghost Witches.
It was also an exceedingly mysterious place. Many powerful witches only knew that Ghost Castle existed, yet could not find its address.
—Yet strangely enough, food delivery workers and postmen delivering parcels could find Ghost Castle instead.
"To enter Ghost Castle, you must hold an invitation from Ghost Castle. That is the prerequisite. With an invitation, even an ordinary land-dweller might accidentally enter Ghost Castle, exchange equivalent goods for curios or resources, and then leave. Without an invitation, even an Archwitch cannot force her way in. It is a powerful protective curse inscription."
Histeria explained it to Jiang Han.
The three of them sat at a waiting station outside Rainy Night Club. In Histeria's words, "Ghost Castle will handle the pickup and drop-off."
"Strictly speaking, the castle possesses a great many resources that can be traded. It is a place where Ghost Witches store their adventure spoils, and a place to cash them out, so marvelous treasures often appear there. Treasures that are normally difficult to obtain might be acquired very quickly in Ghost Castle... And it's quite fun there, too. Excellent top-tier food is often brought to the table. It isn't too bustling, though—there aren't many Ghost Witches to begin with, and neither the servant army nor witches are allowed into the castle's main district."
Jiang Han nodded along at Histeria's words. She remembered that she seemed to have visited