Talk:Diablo/@comment-36209226-20190328130811/@comment-10330822-20190618022649

I'd imagine as long as you are capable of Upper-Tier Demon Summoning, it doesn't matter if you are stronger than the demon summon or not. It's just a question of tribute. Rimuru offered up 15,000 corpses of the Falmas Kingdom's army to summon the Black Progenitor Arch Demon and the other two Greater Demons. Rimuru was actually confused why only three demons showed up, because he didn't realize he had summoned an Arch Demon.

The reason these three, including Black, were so obedient is because they realized Rimuru was "becoming" a True Demon Lord, that is why they referred to him as the "soon-to-be-born Dark Lord", because they realized he was hatching.

So you want to know why they were so obedient upon summoning? It's because they realize Rimuru was evolving into a being on par with a Demon King. That's why.