The Strongest Demon Emperor in the Other World

I was reborn as the grandson of the legendary duke, with the strongest magic talent. However, I became a wreck overnight and was exiled.
When I hold a million soldiers, I swept across the deserted land, conquering countless territories, resources and minerals.
Abyss Legion, Dragon Legion, Blazing Angel Group, Ancient Treant Group...
All listen to my orders!
When Resti Heller led countless divine-level legions out of the deserted land, the emperors of the various empires began to be confused.
What it meant was that even the most ancient empire would fall under the cruel oppression of Heller.
The invincible dynasty, the immortal demon, and the invincible abyss were all crushed!
Only an invincible king was needed in this world!
That was Resti Heller!