The Castian royal family was blessed with dragon blood. Not every member can become full dragons, but the ones that can become kings and queens.
The pure bloodline members are most likely to have full dragons living in them, whereas ones with impure blood are more like to only be able to halfways shift. Into something closer to a dragonborn.
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(Art isn't mine)
The person's personality determines their dragon.
Fire - confident and fearless Ice - cold and cunning Wind - generous and kind Earth - wise and powerful
Their transformation rends their clothes and can be dangerous to those around if the shifter is not well trained in safely transforming. Without their dragons reacting with a spout of fire or ice.
Credits also go to Radio_Raccoon for coming up with a lot of this!
