Dark Fragment is a Mythical material used for crafting and other late game progression.

Obtainment:

The Dark Fragment is obtained by defeating Darkbeard, which guarantees one Dark Fragment upon defeat.

Usage:
Dark Fragment Is Used to Upgrading Swords and Guns and Obtain Fighting Styles and Crafting Items.
Swords:

• Dark Blade 1, 15, 10
• Dark Dagger 1, 8, 10
• Triple Dark Blade 25, 99, 99

Guns:

• Bazooka 1, 15, 10
• Dragonstorm 1, 15, 10
• Skull Guitar 1, 15, 10

Fighting Styles:

• Sanguine Art 2, 20, 20

Items:

• Skull Guitar 1, 500, 250, 5,000
• Leviathan Crown 1, 10, 5