The Scarlet Heir: A Dark Royal Romantasy of Cursed Bloodlines, Forbidden Bonds, and Throne War (The Curse of Glass Kings) by Ariana Valewood

The throne called him a traitor. The vow called him heir. After fleeing Glasshaven with the truth of the Ash Coronet burning behind them, Oriana Crownmere and Evander Blackmere arrive in Redmere as fugitives, witnesses, and something far more dangerous than allies. The court has named her corrupted. The king has named him enemy. But the old magic beneath the realm has begun to speak a different truth. A truth written in salt, silver, blood, and scarlet thread. As Halric Ash tightens his grip on Glasshaven, Oriana uncovers evidence that her cursekeeper blood was never meant to serve the throne. It was meant to stand beside it. But the deeper she follows the lost records of the Salt-and-Silver Vow, the more she learns that Evander’s blood may be the key to a second crown, one the king would rather destroy than let the realm remember. Every public alliance becomes dangerous. Every private touch becomes evidence. Every vow asks for blood. Read more