@Community_Gamer
Wrong and lying, Guro never translate the side stories and you clearly didn't understand the cosmology of Tensura verse. Great spirits gave birth to their corresponding concepts, the last great spirit born and destroy everything to Nothingness.
I thought it said that time and space were destroyed, and this would be impossible unless the Great Spirit of time were killed because even if the concept of time were destroyed, the Great Spirit of time would recreate the concept of time. If the Great Spirit of Time were killed then that would mean that a new Great Spirit was born, which in itself meant that everything would be destroyed including the other Great Spirits. "And since then, these were the great eight spirits. Until the light consumes the world, erasing darkness. Until a new spirit is born, erasing all. Life and death, heralding the coming end of the world."
After reading the chapter again: I looked back and you were correct, time had ceased to flow and space ceased to expand, in chapter 399 or Visit to the Unknown - 19(reread the after stories too) it explains that "once a world loses the power to expand, then it would lose the concept of time as well", and the power of the Mobius System had enough negative energy to negate the positive energy of the expanding universe and return the universe into 0(It also says that the Mobius System was similar to Rimuru's Beelzebub, so I guess that's how conceptual manipulation got in). Rimuru's world getting destroyed would only grant him resistance to conceptual manipulation type 3 because the Great Spirit of Time didn't die but the concept of time that held power in his world did.
Unless there were other examples of conceptual manipulation, then I don't get how Rimuru should have conceptual manipulation since Beelzebub didn't destroy the concept of time, the world lost the power to expand more which is why the concept of time was gone.
Main Points:
There are type 3 concepts in each universe, and the Great Spirits are type 2 concepts that are beyond the type 3 concepts.
Rimuru doesn't have any feats of interacting with concepts, while he does have resistance to type 3 conceptual manipulation, weird thing.
"A spirit is…
“In nothingness power finds its fill.
That is a holy spirit. The great holy spirit is the source of power.
Among these, light and darkness, the two great spirits.
Who came to exist at the same moment as the world.
But, the world was without form, a ephemeral existence.
Light and shadow, darkness and the light. Two existences that shall never interweave.
One day, the great spirit time was born.
The child of light and darkness.
And thus the world began to move.
The moving world spun, without purpose, around itself.
Inside the flowing currents of life and death,
Earth, Water, Fire, Wind, and Sky–these five great spirits were born.
And since then, these were the great eight spirits. Until the light consumes the world, erasing darkness. Until a new spirit is born, erasing all. Life and death, heralding the coming end of the world."
^This is the cause of the destruction of the universe. The universe explode on his face and Rimuru is fine and you forget that the one who creates those spirits is Veldanava and Rimuru is much more powerful than Veldanava.