Undead
Undead in Lorithandar come from four paths…
Path of the Goddess - The fallen mortal souls who Su-Lan the Goddess of Death draws to her realm may be sent back to do her bidding. Most often following a supplication by a Death Priest, these spirits are disoriented and clothed in unfamiliar flesh, but serve their goddess unfailingly before returning to her embrace.
Ghost
Once mortal spirits who refuse the embrace of Su-Lan may linger as incorporeal spirits called Ghosts. These spirits often linger near their place of death or bind to items or people from their life, unwilling to leave. Shaman may make arrangements with such spirits, or bind them forcibly into service.
Revenant
Revenants are disembodied planar spirits who can possess dead flesh animating them with dark purpose. Revenants have no love for the living, and enjoy nothing more than feeding on living flesh. Revenants are most often constructed by use of Sorcery. Because the magic which binds them to the flesh is controlled by their necromantic masters they must obey unfailingly. Their eyes glow with a colored light indicating the planar realm powering the corpse. Green for Stygia, Red for Pandemonium, Blue for Arcadia, and Gold for Aaru.
Stygian Outsider
Native Outsiders of the dark plane of Stygia are sentient and powerful forms of undead. The entire realm of Stygia radiates necrotic energies which empower these beings. They may be enticed or forced through the Barrier with summon spells, but they are most certainly not benign and will only obey if bound into service. Trusting such a creature would be beyond foolhardy. The energies that empower the natives of Stygia has also been harnessed by powerful mortal sorcerers to grant them a demonic unlife… immortal, but twisted.