RedheadEmber said: I thought that was only possible with Suntop and Ember because they're twins. They basically made an agreement while in the womb; "you get the immortal blood, I get the Wolfrider blood."
I was mostly being facetious. XD I find the idea silly anyway...I think Sunstream ended up with the immortal blood and Ember with the mortal blood because of luck, or because that's what Recognition demanded from those children at the time. I don't think there was a conscious decision on anyone's parts...they just say each twin "called" their respective bloods to them because they don't have another word for genetics. Maybe Serrin just got "lucky" and got immortal blood.