Soul Keeper

Soul Keepers are a drop in the Item Game; when placed in the workshop, they will give Sin Souls and sometimes other souls.

Acquisition
Soul Keepers are a random drop in the Item Game; they are usually found in stacks of 1-13, and picked up in stacks of 1-3.

Uses
Besides providing souls, which are a basic component in the Item Game and used for many crafting recipes, Soul Keepers have become a sort of currency. Because of their high demand, many items have had a ratio made between them and Soul Keepers; they are one of the easiest items to trade.