The Standard Power stone of Ece Dunkan is a 2468 years old piece made by Ece Dunkan, a mage living in Troy.
Considering its age and the quality of the work, people consider it of considerable value.
It is engraved with central asian patterns and some symbols pertaining to Yazdanism.
This piece doesn't exist, but as a legend. It is said that in the year 1517, Bugidai Dunkan, the owner, made use of it in Osaka to empower the Dunkan family. Now it is lost, or broken, we will never know.