After Blowing Up the Hero, She Became My Starting Minion

(Loli + bratty girl + adorably useless + Demon King and Hero + System + nonhuman protagonist)

The Demon King Arthas lost to a bratty girl hero who called herself “the Great Me.”

So he activated a forbidden spell that would take them both down.

[Ding! Demon King's Castle System officially activated! Rebuild the glory of the demon race from the start!]

A cold, mechanical voice exploded in his mind. Arthas froze. He was still alive?

Then he noticed a tiny skeleton beside him.

System prompt: [Turn the hero's remains into a minion?]

Arthas selected [Yes].

The most obnoxious bratty girl hero in history became the Demon King's starting minion!