Combat: Like dogs and wolves of the Prime Material Plane, shadow hounds attack in packs using their powerful jaws to drag a prey off of its feet. Once down, the hounds swarm over the prey and devour it mercilessly.
In shadowy conditions (Plane of Shadow, moonlight, etc.) a shadow hound is a terrible foe. It can strike and then blend with the shadows so that it is 40% unlikely to be seen.
However, in bright light it loses 50% of its movement and cannot use shadows for concealment.
Regardless of lighting, +1 or better weapons are needed to harm these beasts.
True. Still, these will drop bay and get savage (or some form), and the light vulnerability will help, too.Yeah, I'm not seeing much to distinguish these from shadow mastiffs.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.