Unlike Cheat Engine or memory injectors, Hero Editor works directly on your save files. You close the game, load your character file into the editor, modify the data, save it, and then reload the character in Diablo 2. It is stable, powerful, and surprisingly user-friendly.
: Modify level (up to 99), experience, strength, dexterity, vitality, energy, and gold. Inventory & Item Management
The "Diablo 2 Lord Of Destruction Hero Editor V1.14" is a popular third-party tool used to modify single-player character files for the original Diablo II: Lord of Destruction