A true immortal of the upper three tiers without any restrictions.
Even the current heavenly court did not have the confidence to deal with it.
There was a good saying.
There were thieves for a thousand days, but there was no one who could guard against thieves for a thousand days.
If that really happened, the heavenly court might even have to abandon the offworld battlefield and withdraw all their forces back into the greater world.
In that case ...
So what if they couldn't exterminate the demons of the void?
When the time came for the demonic abyss to descend.
Those few demon emperors might even cause a lot of trouble.
Therefore ...
He didn't make a move.
Once he made a move, he had to capture all the devil emperors in one fell swoop. He absolutely couldn't let them have the chance to escape.