Soul Suppression Stone

Description
You can get the Soul of the following Creatures if they have 20% or less of their health left:
 * Earth Elemental
 * Fire Elemental
 * Fire Imp
 * Fire Lord
 * Ice Elemental
 * Ice Imp
 * Light Elemental
 * Treant
 * Water Elemental
 * Wind Elemental

Quote
"Used to suppress the soul of elementals which can be revived later in a Summoning Pool"

- In-game description