Frostborn: Excalibur

Long ago, the final heir of Arthur Pendragon guided Britain's survivors through a magical portal into a realm of enchantment, where high elves, orcs, kobolds and stranger beings dwell. Their descendants now govern a large, prosperous kingdom under a High King. Yet a darkness is gathering that could swallow it whole. Ridmark Arban, once a celebrated knight of the Swordbearers, has been stripped of his blade, branded a traitor and cast out, but he is the one who sees what is coming. Calliande wakes in shadow with no recollection of her past, pursued by fearsome powers. She holds a secret that could save the world or ruin it completely: the mystery of the Frostborn.