Constructiveness would be good.
Increases the initiative of dragons by 10% - which is already quite high.
Gives the hero the Armageddon spell. Armageddon does not affect the hero's dragons. Other dragons are not affected by hostile spells that are 3 levels higher than usual. Beneficial spells do affect them.
Basically, no spell has any effect.
Magic Fist does not affect black dragons. Probability-based and simple creature abilities that allow killing a certain number of creatures without considering damage (Deadly Strike, Razor Strike, Devastating Grip) do not affect dragons.
This is completely absurd. I think these abilities are given so that strong creatures can be defeated. I wouldn't use Death Messenger to massacre some weak creatures.
Dragon's Breath and Acidic Breath do not damage friendly stacks.
This is underhanded. Sometimes I defended a Castle only thanks to this nice ability of the enemy. If you don't want to watch where you place your units, then suffer the consequences.
Has a Fire Shield. This unit is already strong, why give it a shield too?
Then, instead, people could have been given Resurrection, which depends on the hero's level.