Carbon-Crystal Edge Treatment

Kethline grows a dark carbon-crystal skin along an existing edge, then laps it until the blade parts inspection cloth under its own weight. The treatment is less glamorous than a new weapon and more useful than most things sold in velvet cases. Karthunai crews favor it because the edge keeps working after salt fog, suit lockers, and months of neglect interrupted by one very bad minute. It does not make poor steel immortal. Hit conduit, stone, or another treated edge often enough and the coating chips away in bright little teeth.