Soulcoin

The Fiends use souls to make them into Soulcoins. These items are made by Soulforges in the Hellish Spire or Demonic Corridors. Mostly they are used as currency by the evil outsiders. If somebody tries to revive a soul turned into a Soulcoin, they must make a Wish first to release them and then use True Resurrection or Wish to grant them a body and revive them. Fiends of high ranking can release a soul from a Soulcoin but almost never do as a soul condensed in this form is tastier to them - they can eat the souls, destroying them, instead of using them as currency. Each Soulcoin is worth a different amount in gold or magical items. For example, a good paladin is worth more than a mere farmer, while the soul of powerful clerics of good deities have the highest value.