In short, they reversed the Power of Destruction and discovered that this force of destruction was a form of narrative layer destruction.
And after the destruction, many of the true essences hidden beneath the appearances of normal matter, energy, and existence were exposed, allowing them to be studied.
As for how exactly they succeeded, how these Alien Races and Subspace Evil Gods acquired the power of the narrative layer, Su Yu did not see.
The technical details are unknown, possibly because they involve their respective paths to transcendence, which are difficult to glimpse.
Anyway, the final result was that they, before the universe completely froze and was destroyed, crossed the current narrative layer and proceeded to the upper narrative layer.
However, crossing narrative layers is extremely difficult. Even with the power of the panel, Su Yu found it hard to cross a narrative layer, so those Alien Races and the Evil Gods at that time were fundamentally unable to do it.
