Souls Online: Mythic Ascension - Chapter 80: Into the Depths

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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The Immortal Path led to Longevity and Sovereign was heading in ease. When the Longevity was no longer in ease, all living beings were just prisoners. Conspiracy, internal strife, and the invasion of the others, all of it emerged together.

In such a world, there was such a young man. He made his way upstream, stepping on blood, defying the emperor, destroying the various kings, and slaughtering his way through the hundred clans to form an Immortal Path towards the throne of Sovereign! The Immortal Path was endless, while the Sovereign was limited. He used his blood to forge his immortal legend.

Sheng Jiaoyang, a scumbag full-level disaster, turned on the fast-passing mode after overturning the car, and happily worked in various worlds.

As a result, accidentally, they all turned into snake spirits.

The playful son on campus, the eldest young master of the wealthy group, the cold and paranoid hero, the playboy of the game world, the noble and cold monarch of a country… These are supposed to be the proud sons of heaven who should have a smooth life, but they all met Misfortune floods Sheng Jiaoyang.

Jiao Yang spread his hands helplessly: “Everything, what if your host is too charming?”

System: “…Just be happy if you’re happy.”

- Description from novelbuddy

The world is like a chessboard and all living beings are the pieces on it!

“I do not want to be treated as a chess piece by the players!”

Defeat in this chess is tantamount to the destruction of my body and I’ll thoroughly disappear! Victory in this chess and I’ll have a very long life!

With the help of an ancient Weiqi piece, Gu Hai arrived at the Divine Province Mainland!

Heavenly Dao is eternal, however life is limited, making heaven and earth pieces of a chessboard, then in the end transformed into a loess, vanishing like faded smoke and scattered clouds. Nevertheless people still jump out of the chessboard, and these people are already prepared for their death while playing chess against the heavens, and perhaps win eternal life for themselves?

“I’ve come, and I want to live through 10,000 lives without any boundaries!”

- Description from Novelupdates