The Game's Extra: Azhriel Odyssey - Chapter 13: Greif l.

This is a story about the protagonist getting the system, going crazy in the biochemical apocalypse, producing aircraft and tanks, destroying zombies, saving good people and killing bad people.

- Description from novelbuddy

The Mc reincarnates in a world of magic and adventure as a Leech, follow his adventure in this mysterious and exciting world as he goes from the weakest creature to the shadow being that everyone is afraid of. Will he pursue the path of strength alone? Or without realizing it he will become the king of the greatest empire that ever lived.

“Ding! You’ve received the [Human Archer (Stage 2)] and has activated the 10,000x bonus. You have received the [Flame God Archer (Stage 10)].”“Ding! You’ve received the [Speed Totem (Silver)] and has activated the 10,000x bonus. You have received the [Wind Goddess’ Speed Totem (Legendary)].”“Ding! You’ve received the [Basic Resource]x1,000,000 and has activated the 10,000x bonus. You have received the [Basic Resource]x10,000,000,000.”“Ding! You’ve received the [Mecha Maid Army] and has activated the 10,000x bonus…”When Li Cheng was reincarnated to the launch day of the game, Tribe, he had received the 10,000x Bonus System.From armies to equipment to talents and skills, he could receive a 10,000x bonus.A few years later, when the world and game merged, people struggled to survive while Li Cheng had already become a godly being…

This is a story about a legend, of one that can never be forgotten.
Summer, first time down the mountains in 16 years, after being raised by his 3 masters and Fairy sister.

‘Why won’t you follow the Rules of society?’ The rules are the tool made by the strong, so I follow my own rules.

‘Why won’t you just use your brain instead of your brawn?’ Idiot! Have you ever seen anyone use their brain, to get back at an ant that bites them!? No, they just casually step on it.

‘Oh, everyone says you’re a first-class beauty huh?’ well, I’m sorry but even you are not qualified to be my wife. Only a ‘Summer class beauty’ is worthy enough!

‘My enemy is sick?’ Oh, don’t worry, even if you’re on your last breath and I feel it’s beneath me to slap shot you dead. I’ll just fix you up and then beat you!

‘Who am I?’

“I am Summer in the spring, the autumn, and the winter, I’m the world’s first above the heavens!”

Follow me, Summer Day as I step by step become known as the world’s first master, the world’s first doctor, the world’s richest man…… a lot of other world’s number one, but most importantly, The worlds happiest man.

- Description from Novelupdates