Fastest Demon Lord Extermination in History ATOM SPLIT

King: Oh great hero, please defeat the demon lord and save the world! Ok now we’re going to check your abilities using this magic ball.
Hero: Nice I got the atom split ability.
King: ... what’s that sounds boring
Hero: Ima defeat the demon lord right now!
ATOM SPLIT EVERY ATOM MODE!
...
...
... KABOOOOOOOOOOM
...
...
...
...
And that was how the world ended