I told you to change your skills, and you changed them into a nuclear explosion immortal?

A global cataclysm has caused the game and reality to merge. Fortunately, humans can awaken their professions at the age of 18 to level up and fight monsters, which allows them to survive.
On the day of his job change, Lu Yun became a mage that everyone envied, but before he could even come to his senses, the system suddenly appeared.
He was pleasantly surprised to discover that he could actually increase or decrease the number of characters in skill entries.
Fireball damage is low? 120% damage increase!
Not only does it deal massive damage, but its effects are also increased by 1200 times, turning a small fireball into a nuclear bomb!
Ice Spike's casting speed is slow? 10% casting speed increase (1000% increase in character count!)
With a wave of his staff, ten blue flame Gatling guns instantly appeared on him!
Ultimate skill with devastating power has a long cooldown? 1200 seconds. (Word count reduced by 0.12 seconds!)
It lasts for 20 seconds, which is equivalent to no cooldown. It starts with a million-strong meteor explosion, leaving nothing but devastation!
From then on, no matter what skill it was, as long as it came into Lu Yun's hands, even a minor skill could be transformed into a forbidden spell!
In this world where leveling up is incredibly difficult, Lu Yun is practically invincible!
However, as Lu Yun upgraded, the system also upgraded.
Not only can you add or remove skill descriptions, you can even change the characters!
% sign? What % sign? It's a multiple sign!
Lu Yun: I'm just an ordinary mage, so it's reasonable that all I can do is use nuclear explosions to wipe out the ground, right?
Human: A small fireball turns into a nuclear bomb, and you call this a regular mage?
All Races: Holy crap! You started with a nuclear explosion to wipe out the enemy?! Are you some kind of nuclear explosion immortal?! Is nobody going to do anything about him?! What? You're saying that was just one of his minor skills?!
Abyss: He was muttering something about a fear of insufficient firepower, and then a sky full of meteors and lightning bolts slammed into my face, waaaaah!