The Old World - Warriors & Heroes - Complete Online Rule Book
Since the downfall of Nagash, the only remaining power-faction of the first cursed undead still currently dwelling within the Old World is that of the Vampire Counts. It is supposedly led by Mannfred von Carstein, last of the Sylvannian royal blood-line. For all their power and cunning, they are ultimately a base, Selfish creature driven by the same motivations of the mortals they deem themselves superior to. For instance, the Brotherhood of Necrarchs strives to attain perfect knowledge of Necromancy and unsurpassed magical power, whereas the Lahmians possess luxury and decadence beyond any dream of avarice.
They share no uniform physical appearance, aside from the fact that most of them have basically humanoid dimensions. Most can pass as human at a distance and hide their ungodly natures behind charm and magical glamour. However, for all their refinement, they are but rotting corpses held together by Dark Magic, and only those who feed well can maintain the illusion of beauty.
Some do not even care to do that and cast aside anything that disguises their true natures, appearing as rotting cadavers that glory in their inhumanity.
For the youngest of them, this is a terrible affliction that consumes their every thought and drives their actions, smothering all sense of rationality and reasoning, causing them to become rash, animalistic creatures that are easily caught and destroyed by Witch Hunters and other dedicated foes of the Night. However, most of their elders are far more subtle, and have learned to subsist on less and less mortal flesh, until finally only needing to feed once every number of years. Regardless, none can totally outrun the primal instincts that now govern their evil existence.
Though their numbers have grown few in some regions, the wicked taint of their kind can still be found in places where the dead are many. The curse they bring with them changes even the soil the walk on, and the air they breathe.
The image links above give information on Undead creatures and beasts.