The Flower of Death (The Forsaken #1) by Jessica Nahas:
 
Many ages ago, the Gods ruled over the mortal lands with an iron fist. Numerous realms suffered under their cruel leadership, until all at once, the immortals vanished. The people of Calibria aren’t sure what happened to the horrid rulers all those years ago. They only know that now, the mortals worship a new religion and all aspects of Gods have been deemed forbidden by punishment of death.

Yet, every full moon, a stubborn young girl is found in a forgotten decrepit temple, worshipping a forbidden God. She prays to the Celestial to heal her dying mother.

Until one late night, she is caught.

This is an adult book that features explicit language and sexually explicit scenes. Please see TW content on website

"I start to hyperventilate and pull my hand away, taking a step back. I catch my reflection in the silver mirror. My face is tanned with dirt, clean streaks running down my cheeks from the path of my tears. My button nose is red from the frosty coastal air. My thin lips chapped and cracked from dehydration. I have been beaten and worn down by life, continuously tested. My energy sucked from my body, leaving me questioning my will to live. I’m angry, furious with what life has dealt me. I want to give up, it would be so easy.

But maybe I don’t want easy.

I want to live and if that means taking the wrath of life’s heat, I will burn in her flames. I square my shoulders and puff out my pale chest, inhaling the salty cold air deep within my lungs, freezing my core.

Whatever happens walking through this Veil now, I know for certain, it will not be my death. I reach out my mud stained fingers and touch the Veil."