Ishikawa Goemon's Kunais

Origin
Ishikawa Goeman is considered the Japanese Robin Hood, a semi-ledgendary outlaw known to steal from the rich and give to the poor. He was ninja that operated in the 16th century, though genuine tales of his exploits are hard to distinguish from the legendary staus of the stories he has been attributed too. It is, however, widely assumed that his skills as a ninja have been greatly exaggerated.

It is fact that he was caught trying to assasinate the warlord Toyotomi Hideyoshi, and was boiled to death with his son.

Effects
This set of four traditional kunai kniveshave a sort of semi-sentience, and will actively chase down their target, viciously mowing down any person who gets in the way. They are activated by first either drawing the blade or stabbing a representation of their intended target, be it a written name, drawing or photograph. Then, when thrown, they move through the air at high speed, manovering around corners and through gaps to chase their victim. They seem to de-activate themselves when the target is dead or if they happed to embed themselves in a solid surface, which seems to shut them down.