Wraith

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Wraiths are evil undead spirits, eternally hungry for the energy of life. In some cases, the grim silhouette of a
wraith might appear armored or outfitted with weapons. This appearance
does not affect the creature’s AC or combat abilities but only reflects
the shape it had in life.

Baatezu sometimes create wraiths by transforming lemures. Dispater keeps them as slaves in his iron city.

Sources: Monster Manual (3.5), Monstrous Manual (2.0), Monster Manual (1.0), Fiendish Codex II: Tyrants of the Nine Hells,  Planescape Monstrous Compendium Appendix, page 10

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