Inadu's little sister

So we know The Hollow was powerful because of magic imbued into while in utero. We know she was cruel and power hungry but what we didn't know, was that she had a little sister.

Enna Labonair was also imbued with magic while in the womb. However it was a different kind of magic, but just as powerful. After Inadu (AKA The Hollow) started showing her true colors they needed a contingency plan, that was Enna.

Enna was the exact opposite of her sister. She used her magic to help the other kids in her village, however her people turned on her.

After they killed her sister they feared 15 year old Enna would be the same. They tried to kill her, however Enna's mother refused to participate which is why the could only put her into a deep sleep.

Now, Hope wants her family back and the only thing keeping her from getting them back is The Hollow. So, when she reads about Enna in an old grimoire she thinks she's found a solution. She decides to take a risk and wake Enna up to reunite her family.