The official GemStone IV encyclopedia.
You are not quite sure what to make of the black warhorse, as you have never seen anything that looks quite like it. Stopping a moment, you try to commit this creature to memory so that you can tell tales of it to your fellow adventurers back in the safety of the local tavern.
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Spectral black warhorses are summoned by lesser moor wights in areas they cannot summon lesser fetid corpses (muddy wetlands):
A lesser moor wight raises one decaying arm in a series of mystical gestures, chanting an almost inaudible stream of prayers.
A cold mist seeps up out of the ground, slowly dissipating to reveal a spectral black warhorse.