A Raven in the Storm (Gods of Tellus #1) by Alida Miranda-Wolff:
 
How far will one woman go to save a dying goddess?

The natural world is unraveling as the tyrant king of Tellus drains the Earth Mother’s magic for his own political gain.

Lady Lyanna Tempestas is fated to rule the Stormlands—until the night she commits a desperate act of violence and discovers the half-eaten Earth Mother. Vowing to stop the king at any cost, Lyanna takes refuge in the Sunlands, the kingdom’s richest and most politically-treacherous court.

Under the protection of the powerful Coronis family, Lyanna secretly joins the Resistance to overthrow the king. As she grows closer to the scholarly and vengeful Cassius Coronis—rumored to wield blood magic—she becomes entangled in a web of revolution, divine power, and forbidden love.

A Raven in the Storm is an epic fantasy debut featuring a complex magic system, a sharp-minded and emotionally scarred heroine, and a slow-burn romance set against ecological collapse and class revolution.