Shadow mastiff
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In the Dungeons & Dragons fantasy role-playing game, the shadow mastiff is an outsider from the Plane of Shadow. It resembles a large mastiff dog (though apparently not quite as long), with pitch black fur, cat-like claws and tail, and an ogre/orc-like face.
The shadow mastiff lurks in shadows and lure foes into them to attack. As light counters the only real special advantage they have, darkness, they are frightened of it and try to stay in shadows and darkness whenever possible. They attack with their claws and teeth. It trips people as well. Their howl can panic people. It can also complete disappear into shadows to give it total concealment even in light.
Shadow mastiffs cannot speak, but understand Common.
They are neutral evil in alignment.