I think you guys are being a bit unfair. I'm sure this would have a 4.25 rating if one of the older hands had put it forth.
As for myself, I think that it still needs some work in terms of additional plot hooks. We could all probably come up with a few good uses for this toxin (Wulfhere's already started!), so why not put a few forth. Flesh it out a bit. What exactly is a Howler Demon? Why should we be afraid of it? Do Demons reproduce sexually, and even have pheremones?
I could see a large problem with the respiratory and circulatory systems- the lungs and hearts of both animals would need to be enlarged to cope with a sudden increase in mass. Would the human head get too hot, as it's less efficient at shunting excess heat than its equine counterpart?
Otherwise, a very nice way of making a legendary creature more palatable and realistic. Good work. Go to Comment
Dwarven Mountain Pony - a small, and hardy animal well suited to living in the mountains and highlands. Able to subsist on grass and brush, with hard hooves, and nimble feet. The dwarves use them as pack animals, and to pull ore carts, and to drive bellows for their furnaces. Never ridden as dwarves like to keep both feet firmly on the ground. As stubborn and tough as the dwarves themselves. Also only about 12 hands tall (1 hand=4 inches)