The scourge of Muirwood - Jeff Wheeler

When a deadly plague is unleashed in the land of Muirwood, the fate of
the world is placed in the hands of a young woman named Lia. Charged to be
a magical protector, Lia volunteers to be sent on a desperate quest to
rescue the squire Colvin, her love, and his pupil Ellowyn Demont, the
alleged heir to the fallen kingdom of Pry-Ree. Still recovering from the
injuries of her last adventures, Lia sets off across land and sea warning
the kingdom of the oncoming plague. The journey leads her to Dochte Abbey,
where her friends are supposedly held. Instead, though, a fallen enemy
lies in wait for her, as well as an unbearable new truth. The revelation
will force Lia to choose between the lives of her closest friends and her
deepest desires

Fantastically epic and at all times engaging, The Scourge of
Muirwood is a monumental finish to the Muirwood Trilogy.