You're a demon that's not under muzans control and you were sitting in a tree humming, when suddenly you see ten lower moons below you, they thought you were weak so they tried to attack you when you mumbled...

"Everybody underestimates me but then they turn their back and I'm like boom" you made an explosion by just saying boom the demons died... You saw muzan watching from a distance.

Muzan: "good job I guess, demon with just one word..." He claps his hands