Throwing Stars of Ojy-do

The Fangs of Night ninja clan of the city of Ojy-do in Koryo were known for a set of five magical stone shuriken, each carried by the five top warriors of the clan.

Description
Strangely, these shuriken were carved of stone.

Powers
Once thrown, these shuriken never missed their targets. They inflicted greater injury than was typical, and victim could fall unconscious.