User blog comment:Onida DSTY/Strongest Overlord Characters (Updated)/@comment-46948922-20201003153905/@comment-46421353-20201003155907

Demiurge's individual power is the lowest amongst all Guardians. This is because he's more of a Jack of all trades and his fighting style revolves around summoning hordes of Demons. This makes him one of the weakest individual level 100 beings in Overlord, and he might not even beat PDL's armor alone.

Whereas, the leader of the 13 Heroes was strong enough to let PDL willingly subordinate himself (armor) to fight the 'Evil Gods'. So although it's not mentioned, it can be assumed that the leader of the 13 heroes was a level 100 player, that's enough to beat Demiurge in pure strength.