I saw people discussing on other plataforms about who is the other and to me is obviously Slátra, Elluin/Raeve former moonplume dragon.
Here’s my theory on how: I believe Slátra took Elluin with her to the sky and breathed live inside her for one century. She also transferred her conscious to Elluin during the process (if it was intended or not, it is not clear). When the process was over, Slátra fell from the sky and Raeve’s life begun. Sadly, she was captured by Arkyn (apparently an older half brother of the Vaegors) and tortured with flames, latter being called Firelark and forced to fight for her own life.
Slátra still tries to protect Elluin/Raeve how she cans, keeping difficult memories concealed under the “ice lake” with her or taking over Elluin/Raeve’s body to fight for things important to her. She also protects Elluin/ Raeve from her own abilities with fire/Ignos, because she can’t tolerate the flames after the years of torture.
