Global Killing: Talent Can Be Upgraded to SSS Level in Unlimited Seconds

A hundred years ago, when the end of the world came, all human beings would awaken their first skill talent when they reached the age of eighteen! Hundreds of countries are fighting, and there are many powerful guilds! At the age of eighteen, Chen Mu started with F-level skills. Fortunately, after awakening, he automatically upgraded the SSS system in seconds! All skills are automatically upgraded to sss in seconds! Congratulations on obtaining the F-level invisibility aura, which will automatically upgrade to SSS-level complete invisibility! Congratulations on obtaining the F-level acceleration skill, which will be automatically upgraded to SSS-level unlimited teleportation! Congratulations on obtaining the E-level summoning skill, which will be automatically upgraded to SSS-level summoning of the undead! … This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.