With his pride being imposed on reality, it was possible for the Demon King of Pride to control reality itself!
Such as, avoiding the reality of him being sealed.
Of course, it was also possible to change reality and make his death an illusion. However, that was unnecessary as he was already immortal even without the Pride Authority.
Because of that, his usage of the pride authority was mostly to prevent the reality of him being sealed. He wasn't worried that he would die, but he feared being sealed.
Arctos only dared to run rampant in Fantasia due to the absence of the nine heroes as they were already dead.
However, if he was sealed and the next batch of heroes arrived, he wasn't that confident he could defeat those new batches of nine heroes.
After all, he wasn't the one who defeated the nine heroes so even if he was prideful and arrogant, he still lacked the feat to prove himself that he was the strongest Demon King in all history.
