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Any Mobs & NPCs encountered in CastleMiner Z that can be defined as Undead are found here. The exact definition (from Wikipedia) is of something that can be classified as undead is "Undead is the collective name for beings that are deceased and yet behave as if alive. It could also describe a dead body animated by supernatural forces (or some other life force) or either by its own soul or the soul of a malevolent creature (such as a demon). Undead may be incorporeal..."
There are currently 3 forms of Undead:
Note: It might be disputed (from the definition) on whether other existing and/or future Mobs & NPCs can be classed as Undead.