Fra'al Glass Knife

The Fra'al Glass Knifes are jagged dagger-like blades that look as though they were made from a single smoky crystal. Created by the legendary Fra'al, they are known for their strength and are sharp enough to split ceramite. They constantly maintain their sharpness by continually fracturing tiny shards from the edges, and these splinters are infamous for working their way into wounds, causing agonising injuries.^[1]

Sources

• 1: Dark Heresy: Disciples of the Dark Gods, pg. 74