A Spirit is not a Ghost, but it it not entirely clear what they are. Some seem to be forces of Nature, akin to Elementals but of Fay origin. Others seem to be manifestations of the dead, as evidenced by a vial of spectral essence (trash loot) being in their loot table. During the quest Groaning Bracers in Wailing Caves, as you enter The Burial Pit where spirits of Shin'Ree Orcs congregate, the quest suddenly completes with the text, "A wisp of light streaked across the cavern and darted straight for the bracers." From this we learn that a spirit is also a wisp of light.
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