Infinite Upgrade of Fireball: Starting from the Slaughterhouse

Consume the longevity energy to upgrade the fireball technique infinitely! Chen Tian traveled through the world of immortality. At the beginning, he was just a slaughtering handyman at the bottom of the Qi training level. Fortunately, he activated the [Upgrade Panel]. As long as you kill the living creatures, you can plunder the longevity essence, which can not only be used to upgrade the level of skills and spells, but also the fireball technique can be infinitely upgraded. Perfect level 1 fireball spell is mediocre. The level 10 fireball skill is barely adequate. After completing the level 100 fireball technique... It will start to explode with power! When it reaches the 1000th level of perfection... It is even more earth-shattering! Then, Chen Tian became invincible. "Isn't the Nascent Soul stage very exciting? I wonder if you can withstand my 10,000-level fireball technique?" This book is also called: "There's nothing that one fireball can't solve. If there is, then two!" The introduction is weak, please move to the main text, thank you all.