Death

Death is the least seen but most feared of the Four Horsemen in the West.
Death, when it manifests usually appears as a cloaked rider on a pale horse.
Death is associated with zombies, vampires, and vultures among other things.
Those familiar with the history of the World that Was believe that Death may be Tzeentch reborn, others believe he is Nagash reborn.  Others believe Death is a new entity, perhaps created by the massive death toll that accompanied the end of the World that Was.

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