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In World of Warcraft, many creatures have a life force called a soul. These may be captured by a Warlock in the creature's final moments of life, by the warlock casting the spell Drain Soul on the creature. If the creature was to die while Drain Soul was active, and that creature would yield experience upon its death, then the warlock creates a Soul Shard upon the death of the creature. That soul shard may then be used as a reagent in several other Warlock spells. Frostmourne can remove souls.