Sovereign is the Crown of Beasts

Alunéa is a nurse who goes into a storm-churned lake after a toddler and doesn't come back out the same way she went in. A portal thirty feet below the surface takes her to a world with no name, where she wakes on a burning beach. What follows is survival in a place with no interest in explaining itself to her. The beastkin who inhabit it have never seen fire, let alone a lone human female. She has the scrubs on her back, an unknown voice in her head claiming to be a system, and somewhere ahead of her — a portal she has to find again.