Levi waved his hand, and an ancient book appeared, resonating with endless wails of the Undead and chilling winds.
"My [Book of the Undead]... I feel like it can be refined together with the [Seven Jails Demon Tower] to form a systemic artifact, akin to Hundred Flowers' [Star Ring] and [Tower of Summer Flowers]."
For now, the functionality of the Book of the Undead overlaps partially with that of the Seven Jails Demon Tower.
And it's less complete than the latter. Levi thought about integrating the Book of the Undead into it.
This would further enhance the power of the [Seven Jails Demon Tower], turning it into a usable Wizard Tool.
"But this matter can wait until I advance to the seven-circle level."
Within the Ancient Banyan Fairyland, there is a place called the [Graveyard of the Dead], which serves as a cultivation ground for the Undead spirits residing in the Book of the Undead.
