The Book of Fate has more than a passing resemblance to the Book of Ages.
The tree that Tracker is sealed in is referred to local who live near it as the Edelwood.
The original Changelings were meant to be infertile and die off once they had served the purposes of Meridian's royalty. However, they reproduced both among themselves and with Meridian's other races. As Queen Weira states, life refuses to be guided solely by intent.