The Ring of Progidious Power is obtained by killing Moleck found in Ahkma Cave in Einhoren.
The Ring normally drops when he is killed. The ring is can be useful to anyone using a melee weapon such as a Sword, Mace, Axe, Zhen or Katar. Since the Ring of Progidious Power is a blue named item, it cannot be traded in-game. It can only be traded through the exchange market. It is highly recommended any party's killing the Moleck to set the party's distribution to "Free" and have any melee weapon users obtain the item.