This hatchling appears to be... dead?

Perhaps not. It seems to be active during the night.

Young dragons are relatively defenseless. They are born with relatively soft scales, which are shed and replaced with harder ones as the hatchling matures. Once a hatchling’s wings grow in, it typically marks the beginning of maturation. At this point they are often capable of hunting on their own and are usually left alone by their mother.

Horehound is not a dog, though he may look like one, maybe one from the depths of Hell. He was, in fact, named after a plant; there was a bunch where his egg was laid. The son of a shadow walker and black dragon, he hasn't lost his ability to "ghost" around, though he has to think hard about it lest he become corporeal while in a solid. Which would be very bad. He also inherited his father's fighting ability and willingness to stand his ground. The motley group of dragons who found the egg are wary that a magical-warrior-ghost-vampire can be dangerous and have been careful to raise him to be a productive member of the group.