Items

The dragons always believed - the bigger wings, the stronger flyer.
Some even believed that their front limbs were useless. 
And so...
That's when they begged. And begged. And begged.
Up until certain hatchlings were getting hatched without front limbs. 
Their parents were mortified, yet believed that the Gods had plans for their young ones... Not that they were cursed.

The Dragon's Will grants the Wyvernism mutation.