Turbine's official Dungeons & Dragons Online: Stormreach website has been updated with its twenty-sixth monster profile, this time detailing the Thaarak Hound. A little something to get you started:
After meeting one of the daelkyr's hunting hounds, my advice to the adventurer encountering it for the first time would be: run. Of course, given the creature's dogged (ahem) persistence and quick speed, that's not especially likely to work. And while the tharaak hound may be amused by entreaties for mercy or surrender, that avenue isn't likely to meet with success. So, fight you must, though the odds be long. Perhaps you'll have time to scratch out a loving good-bye to a friend, mate, or mother on a nearby stone or wall.