I like it a lot.

You should probably clarify that Enlarge works on the Draugr despite them not being humanoid. Silly, I know, but this is D&D.

I think Draugr had some kind of horrible stench. Maybe copy that from the Ghast, which seems pretty Draugr-like anyway?

I'm not sure about the animal-slaying aura. I thought they drove animals mad, not killed them? That could even be a small adventure hook. All animals near the Draugr's grave go rabid, that could tip the PCs off.