I Just Went for a Walk in the World of Immortality, Why Did the Sky Fall?

Revenge, a Mad Protagonist, No Saintly Martyrdom, No Hiding Their Strength, Strongest from the Start

No System, or the System's abilities should be very limited. The male lead is a killing machine.

Looking for Protagonists Who Are Blacksmiths, Artifact Refiners, Swordsmiths, and the Like

Blacksmithing or Forging Stories Where Crafted Items Get Random Attributes

Looking for books similar to One Piece: The Max-Level Blacksmith of Marineford.

Stories About Blacksmith Protagonists Who Forge Weapons and Open Weapon Shops

Transmigrates into a Blacksmith, and the Authorities Send Him a Wife

Transmigrate

Transmigrate to a World of Ghosts and Monsters, Then Practice Martial Arts

The protagonist transmigrates to another world full of ghosts and monsters, and has a System.