Six Realms Wikia

A warsword is a ceremonial non-combative sword awarded to Stahlborn upon their legitimacy. Traditionally, an individual will carve the names of their kills in battle onto the black steel of the sword, until the warsword is brittle enough to shatter. Once shattered, the omen is perceived as a warning from the Stahl Father, and the individual must abstain from further conflicts.

The only known person to have shattered their warsword is Konig Stahldritten.