The disaster that destroyed "that empire" was also connected to the destruction of the Ancient Magic Civilization on the Akasha Continent!
This was undoubtedly a very bold conjecture.
Had he encountered something like this in another world, Riezel would certainly have regarded it as a pure coincidence and never connected the two.
After all, as far as he knew, only the Dimensional Cube possessed the power to cross dimensions.
Without the Dimensional Cube's power, two different dimensions could never possibly be connected.
But the problem was...
First, the Reinayl Clan had played an extremely important role in both disasters. They had even been at the center of both catastrophes. And this Reinayl Clan happened to be a clan capable of using the Dimensional Cube's power for Dimensional Travel, giving the two different dimensions a means of connecting with each other.
Second, unlike other dimensions, both the Great Source World and the Akasha Continent were original worlds, rather than another world like DanMachi, Demon Slayer, Overlord, or Fairy Kingdom Lostbelt.
The connection between two original worlds was naturally much deeper than that between other worlds. This could be seen from how Dimensional Travel between them had no time limit, did not result in consciousness descending, and could easily carry people back and forth between the two worlds.
While returning to the Akasha Continent, Riezel had even heard prayers from the Source World before leaving the Dimensional Passage and received Source's summons. That alone was enough to show that the connection between those two worlds was closer than that between any other worlds.
Taking all those factors into account, Riezel had boldly speculated that the destructive disasters occurring in the two original worlds were linked in ways unknown to others.
That was why Riezel had come here, intending to cross Narnirga and