The Cursed Priest：The 14th Bride of the High Tower

Princess Ella is framed by her stepmother and stepsister. She meets Aldric, a cursed High Priest turned lava-like monster in a tower, and conceives his child. She passes the Moon Goddess's trial, but her pregnancy is exposed. Fleeing, she is sentenced to burn. Aldric saves her. His curse can only be broken by true love. Ella awakens lunar power, breaks the curse, and they live happily with their child.