Six blades forged. One for each of the six assassin kings. Passed from one king to the next. One destroyed And one captured. The remaining four kings fled taking these blades with them into the shadows, and off the pages of history.
Dark blades use the profile of an average dagger. when gaining a damage bonus for higher rolls (17-20) add an extra +1 to the total damage.
While attacking with a dark blade gain the move/esoterie/trick: Mark target (2 Intellect) target becomes the assassin blades prey. The blade becomes an asset to all attack rolls against the prey til they are dead or a new target is marked.