To complete any great treasure, it must draw Tribulation, because the act of creating a treasure was seizing a portion of the authority to power in reality and binding it into a corporeal entity.
In the case of the treasure Rowan had just created, that meant that he was essentially taking the dimension of this Spectral Titan and everything it contained and molding it into a shape that he desired.
This was a dead realm of a seventh-dimensional creature, its powers and vitality still lingered in every single part of this realm, and Rowan would have to prove that he was worthy if he wanted to change the state of this place into the form he desired.
The Tribulation for the Tower of Greed had been a strange one, it had drawn Rowan into an Abyssal Space, since the root of the tower came from the Great Abyss, as the first building block was created from the skull of a Great Demon King.
