Bone Dragon and Ghost Dragon

Necropolis creatures
Level 1
Skeleton
Skeleton Warrior
Level 2
Walking Dead
Zombie
Level 3
Wight
Wraith
Level 4
Vampire
Vampire Lord
Level 5
Lich
Power Lich
Level 6
Black Knight
Dread Knight
Level 7
Bone Dragon
Ghost Dragon
Towns

Bone and ghost dragons are level 7 creatures of necropolis town. They are recruited from the dragon vault.

Bone and ghost dragons are raised from dragon corpses. Both of these creatures have a ferocious biting attack and lower the morale of enemy units by one when they appear on the battlefield. Ghost dragon attacks have a 20% chance of aging their targets. Aged troops have the hit points of all their members halved. Placing Hydras or any living Dragons in the Skeleton Transformer will give you Bone Dragons instead of regular Skeletons. Bone and Ghost Dragons, however, being undead (and therefore non-living), get turned into Skeletons.

Bone Dragons are the only type of dragon that don't require any magical resources to recruit.

Bone Dragons have an AI Value of 3388, while Ghost Dragons have an AI Value of 4696.