An item that supposedly increases the chances of getting Sokoban drops from killing Yojimbo. It also supposedly increases the chances of finding Yojimbo in a RD. There are probably other supposed effects as well.
The examine info reads: "This magical stone improves your luck. Only one works at a time, and it must be in your inventory, not in a bag
It is made of magically compressed leprechauns.
Weight: 0.06 lb"