The Nameless Throne. The Inkweaver Archive, #1

An ambitious orphan. A ruthless warlord. An impossible destiny. Arya Nameless is a lowly Raider posted to an isolated fort in the most dangerous place in Dunidaen. She has few prospects, and as much as she loves her fellow soldiers, she burns for more-more control, more autonomy, more power. When her bravery during an unexpected attack leads to an offer to join the household of one of Dunidaen's warlords, Arya finds a home and family she never expected.
Yet her quicksilver temper and fierce pride put her place there at constant risk. And as her warlord embroils them all in a dangerous political game to rule Dunidaen, over the border to the west, the Nightstalker lurks. A king who wields powerful magic, the Nightstalker's fate is inextricably entwined with Arya's. His relentless pursuit will force Arya into a choice she doesn't want to make ... between the family she would die to protect, and the power she may need to destroy everything he stands for. Perfect for readers who love wyvern bonds, dangerous courts, fierce found family, and an underdog's rise to a stolen throne - a complete four-book epic fantasy.