"Matthias!" The System Lord had a shocked expression plastered on his face. He did not expect Matthias to visit. But still, he was elated.
Matthias didn't respond and instead went straight to the impostor and bombarded it with attacks with the Universal Laws combined within it. If Matthias learned something with the knowledge granted to him in his ascension, one of those would be how to counter an invading force, especially the Eldritch.
Eldritch Beings, as creatures devoid of a real home, wandering aimlessly in the Void of Existence, their energies would be greatly rejected by any universe they try to enter. Their powers would weaken, their sizes would shrink, and sometimes, even their intellect and soul would slowly deteriorate.
Therefore, instead of entering personally, the Eldritch Gods would send some henchmen or even items to corrupt the world until it finally succumbs to them.
