"Necropolis" - changes to creatures of levels 6-7.

Yeah, on level 7, with such low stats (and even lower if you keep this ability), it's only good for leaving him to fight neutrals. Otherwise, it's not very interesting to watch when this ability triggers almost constantly, and the opponent just runs away from you, with only a Warlock occasionally hitting you with something powerful (or a Ranger with elder Druids and their channel ability shocking you). If you do leave it, you should somehow reduce the chance of it triggering, and if that's not possible, then just remove this skill altogether. Then you could give this ability to one dead dragon, and give the other incorporeality and no more than 200 HP, because in the mod, they have 450 HP, and they're placed on the map in the same quantity as Death Knights used to be (and those were clearly three or four times weaker).