In soulsmith we saw Eithan giving Lindon madraso why not give the ability to Lindon ... like what if Eithan saw Dross and thought Lindon could handle the family ability and poor madra into him and to push his pure core to true god as well. Man that'd make Dross into BIG BROTHER
Will may have give that answer before skysworn ... because both Jai Chen and the underload gained the ability after absorbing Eithan's madra.
Just noticed this, so I'm popping in: Jai Chen and Jai Daishou got the ability temporarily by draining power from Eithan. They didn't gain it permanently. It's not their bloodline power now.
How temporary are we talking? Would it wear off in hours? Days? Years? I got the impression that it had become a permanent part of her but that she had to actively expend Madra to make it work.
Her madra has permanently changed, but her bloodline hasn’t. And at the point where Jai Chen leaves, she still hasn’t stabilized her madra yet, so it hasn’t settled into its final composition.
This isn’t even its final form, if you will.