Seirei Gensouki: Spirit Chronicles: Omnibus 9

Contains the complete volumes 17-18!
Rio returns to Yagumo to update his friends and family on the battle with Lucius. Along the way, he stumbles into an unexpected reunion... Does it portend fortune or disaster?
Meanwhile, a kingdom on the edge of the Strahl region has fallen to a black-haired saint named Erica. With the crown fresh on her head, Erica now leads her revolutionaries to war with the next major nation. Just what drives her rampage?