I already miss the elegance of the 4e stat block. And, the lack of description for the Nothic is criminal. How could a new DM run one?
It's a stat block in an adventure in a $12 starter box which seeks to be as concise as possible. I'm sure the description will be in the room description or what-have-you. They can't keep repeating luff text without making the boxed set cost more.
The Monster Manual will have a description, ecology, picture, favourite colour, and what he did last summer.