Countless planes were corrupted. Tens of thousands of planes became dead ruins, and only by transforming into demons could one survive within them.
Lucifer did not care in the slightest. More than ninety percent of the multiverse consisted of lower planes anyway, so there was no need to concern himself with the resistance of the creatures within them.
Even if some ocean worlds were middle or higher planes, Lucifer only needed to send more of his consciousness down. His incarnations would then be able to sweep away every obstacle.
Of course, when he encountered a higher plane, its inhabitants could resist the aura of the Abyss. Once Lucifer confirmed that Uchiha Shin was not there, he generally would not descend to wipe them out.
The farther a plane was from the Abyss, the harder it was for him to project his power into it. Higher planes still had some tough bones to chew, especially those whose crystal walls were exceptionally sturdy—even the power of the Abyss found them difficult to corrupt.
If not for the guidance of the Book of Ten Thousand Demons, many higher planes could resist the aura of the Abyss through their crystal walls alone.
For example, even within the Abyss, the leader of the famously Burning Legion was widely known: Sargeras, the renowned fallen Bronze Titan. For years, he had sought to destroy a world called "Aeglas."
Yet that world's crystal wall was exceptionally sturdy, and it was protected by a group of Titans. Sargeras himself could not descend there, and his invasion plans had been thwarted time and again.
The Demon King was utterly enraged by this and swore that he would destroy that world. Unfortunately, he had yet to succeed.
Of course, if he possessed Lucifer's Book of Ten Thousand Demons, he could directly