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." ^{RoE manual}

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 doesn't require any magical resources to recruit. They are also one of the two flying Necropolis unit, the other being the Vampires, making them good for sieges.

Aging special ability

Ghost Dragons have aging special ability, which has 20% probability to occur after they have attacked target creature stack and before the stack has a chance to retaliate. It causes maximum health of every creature in the target stack to be halved. The effect lasts for 3 combat rounds, and can only be removed with the Cure or Dispel spell. Additionally, non-living creatures are immune to aging.

When Ghost Dragons successfully ages a stack, any health lost before the aging takes effect remains lost. However, the aging cannot kill the unit, but it will have 1 health left. For example, a Ghost Dragon attacks one Angel and deals 60 points melee damage before the aging occurs. The Angel will have 40 points health left, which is the result of calculation

200÷2-60 = 40

If the damage of the Ghost Dragon would have been 130, the Angel would have had 1 health left, which would have been the result of calculation that is two process:

First. 200-130 = 70

Second. Max(70- (200- 100),1) = 1 .

200 is previous maximum health and 100 is maximum health after aging. Also 70 is remain health after first process (usual process).

If you use cure spell whose the amount of health is 30, the Angle would have had 131 health left, which would have been the result of calculation also:

First 1+30 = 31

Second. Min(200,31 + (200- 100)) = 131 .

200 is previous maximum health and 100 is maximum health after aging. Also 31 is remain health after first process(usual process).

The effect of aging has a multiplicative effect with Wyvern Monarchs' poisonous ability. This means, that the creature stack's health could potentially be quartered.

Creatures immune to aging:

•  Black Dragon

Elementals:

  Air and Storm Elementals

  Water and Ice Elementals

  Fire and Energy Elementals

  Earth and Magma Elementals

  Psychic and Magic Elementals

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Undead:

  Skeletons and Skeleton Warriors

  Walking Dead and Zombies

  Wights and Wraiths

  Vampires and Vampire Lords

  Liches and Power Liches

  Black and Dread Knights

  Bone and Ghost Dragons

 Mummies

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Gargoyles:

  Stone and Obsidian Gargoyles

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Golems:

  Stone and Iron Golems

 Gold Golems

 Diamond Golems

 Steel Golems 

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Mechanicals:
  Automatons and Sentinel Automatons 
  Dreadnoughts and Juggernauts 

See also:

• List of creatures