Mass Hero Summoning

It took Ren and his army a year and a half to take over almost half of the continent. The speed at which he was conquering the continent was ten times faster than when he was Demon Lord Kretos. Still, Ren felt a bit disappointed at this outcome and sighed. 

'Well, in this era the various races have become much, much weaker than before which has been an utter disappointment. Also for some reason, the most powerful hero type hasn't shown themselves yet... Thought that in itself is rather weird... I already cause so many problems and the other side obviously knows they're no match for me and my army, then why haven't they used their greatest trump cards the heroes? Hmmm, maybe they already sent them and they weren't even worth mentioning, or because this time around I'm human making them feel like I'm less of a threat than when I was a demon lord.'