A taboo, as Erzulie believes they are against the cycle; therefore they represent The World card reversed.

Undead do not have hearts. Even if a humans heart is there, it will never beat if they are dead/undead. Therefore, they do not have souls, and are just walking bodies.

Undead magic is equal to the "black magic" of Alluvien. It is said to be possible due Sabado, as making a deal with them is the easiest way to receive an undead corpse, though they have no part in the already existing concept of undead in actuality.

Outside of magic/intent, undead can still appear “naturally” via those with ends they don't accept, longing to change how their life was lived (The World card reversed). They can appear as mindless body(undead) or rarely “soul”(ghost), but never both. They are incredibly rare to find as they naturally deeply fear Erzulie--ones that do not fear her are rid of by her.

Zonbi