>>720687985
What if they had a the literal crest stone?
>Byleth witnesses the birth of one of his great great grandkids
>Oh shit they're stillborn
>Byleth rips out his heart and puts in in the new baby like Rhea did all those years ago
>Byleth dies, but this kid lives and now has their very own angry loli (adult form) in their heads

I'm just spitballing here, I'm actually more in the thinking that the only reason we're seeing Sothis in this game is because one of the characters is witnessing the flashback of another long dead character.