Several years ago, a Dr. Aelara Myst, tried to achieve immortality. However, they used eldritch horrors to try to achieve this but she was split in half by her two most defining traits her intellect and her wisdom. This split created a set of identical twins, Elara and Alara. She isn't sure if she is immortal but by the passing day the two halves are becoming more different and Alara is scared she won't be able to push back together.
No one is sure which twin is which. Not even they no which twin is which.