Money, wealth.
This was a huge problem!
After launching the Floating City project, Soren suddenly felt the strain on his previously comfortable finances. Leaving aside Goria and the Fallen Witch's incredibly expensive experiments, the renovation work for the first phase of the Floating City project alone cost an enormous amount. To put it in perspective, building a Floating Tower was like building an aircraft carrier: merely somewhat difficult for a nation. Building a Floating City, however, meant leaping into another technological era to build a Space Warship—a Space Fortress. The rate at which all that research and all those materials burned through money was downright terrifying!
Take Goria and the Fallen Witch, for example.
Even if their research made no progress whatsoever, the two of them would burn through at least thirty thousand Gold Dalers' worth of materials every month.
Across the entire Material Plane, only Soren and Port Nyanzaru could bear that expense. Any other faction would have gone bankrupt almost instantly. Routine experiments alone consumed three hundred and sixty thousand Gold Dalers a year, and if they achieved a breakthrough, the funding required would multiply.
Things had been fine before Soren launched the Floating City project.
Afterward, he realized that even as a deity, earning enough to support these two women who spent money like water was no easy task!
Still.
If Goria and the Fallen Witch succeeded, the benefits would be unimaginable. They would practically be advancing an entire civilization.
In short.
What Soren and Port Nyanzaru were doing amounted to single-handedly advancing civilization on the Material Plane.
Naturally, the rate at which they spent money was easy to imagine!
Perhaps because their spending had been so steep lately, Soren was even considering bringing the Princess into the project. Arendelle still had plenty of wealth, after all.