1. Causes aging
2. Flies far
3. Cheap
Disadvantages:
1. Weak Attack and Defense
2. Low damage
3. Low health
I think it's more important than the pluses... And besides, it's not that beautiful...
Its ONLY major advantage is that its creators made it a 7th (highest) level unit... As I said, K. Dragons are far from being the deciding factor in Necropolis...