A Sea of Shields (The Sorcerer's Ring #10) by Morgan Rice

In A SEA OF SHIELDS, Gwendolyn gives birth to her and Thorgrin s child, amidst powerful omens. With a son born to them, Gwendolyn and Thorgrin's lives are changed forever, as is the destiny of the Ring. Thor has no choice to but to embark to find his mother, to leave his wife and child and venture away from his homeland on a perilous quest that will have the very future of the Ring at stake.

Before Thor embarks, he unites with Gwendolyn in the greatest wedding in the history of the MacGils, and he is given the honor he has always dreamed of when he is inducted into the Silver and becomes a Knight.

Gwendolyn feels a looming danger to the Ring, and furthers her plans to rescue all of her people in the case of a catastrophe.

Erec receives news of his father's illness, and is summoned back home, to the Southern Isles; Alistair joins him on the journey, as their wedding plans are put in motion.