Scions are a big deal for elven culture, but what they really are? The status of scions isn't directly correlates to Tir-Cendelius godwokens, like Sebille being the prime scion, but they somehow are very important for elves as sudo-leaders.
In share-the-source ending, the best one for everyone, elves split into two faction : one who wanted ancestor trees(like Mother tree) and another who wanted to be ruled by scions. But who are the scions and how they're selected?