The Hungry Fortress Wants to Build a Battleship in Another World – World of Sandbox - Chapter 34Vol 1. : If There’s No Bread, Eat Kelp

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

Eren Idril died as an old, decrepit, and piss-poor adventurer by the maws of a D-Rank monster. He had a lot of unfulfilled dreams and desires that couldn't see the light of the day after the light in his own eyes died down.

But fortunately for him and unfortunately for the world, that wasn't his end. Eren was somehow dived back in time when he was a mere teen, attending Lionheart Academy for adventurers.

When life gives him a second chance, Eren decides to exploit it to its fullest. Experience his vile deeds as he partakes in them without feeling the slightest bit of hesitation.

The Heavenly Dao is fickle. A phrase that he had heard all through his life. Only after that incident did Adrian truly understand the meaning behind those words.From someone who had it all, wealth, power, prestige, to one without anything. Heck, even his fiancée abandoned him.One of the Twelve Great Houses on the Floating Cloud Continent, the House of Thorne was reduced to a pile of rubble and dead bodies after a mysterious attack by the Demonic Faction.All that remained was a blood-soaked pendant and a broken future.That is, until his blood awakens the pendant, unleashing a dazzling light. When he regains consciousness, his pursuers are gone, but so is the life he once knew.Now with only his younger brother and a loyal servant girl, Adrian sets out into the night.Armed with only the mysterious pendant and the inheritance it contains, he must walk the path of cultivation.Can he rebuild the House of Thorne from the ashes? Will he uncover the traitor who aided the demonic faction?He won't stop until even the heavens know his name and fear it.

The year 1847