Cain didn't hesitate before sending all the golden origin force from the Sky Master Innate Abilities into his Dragonform. After the clash with Amir, it became clear that his Dragonform would become the core of his battle style, amplifying all his abilities and skills through its immense power.
The golden energy from the Sky Master Innate Abilities, which could have evolved an ability at the Peak Sky Lord Tier into the Legendary Realm, barely nudged his Dragonborn form forward, offering only a slight improvement.
Cain understood that the higher his Innate Abilities climbed, the more energy they demanded. Dragonborn was now near the peak of the Stellar Abyss Realm, but it would require much more energy before it could evolve to the next tier.