“Yai se corthu” is the shin’a’in phrase that means “two are one.” In this book, Vows and Honor by Mercedes Lackey, a plains woman sets off on a hunt to eradicate the people who demolished her tribe. Along the way she meets a mage who aids her in this journey. The two make a blood pact, overseen by the plains woman’s Goddess, and Yai se corthu. Together they set off to build up a reputation so they can revive the plains woman’s lost clan. They face many challenges, but yet they continue. This stunning fantasy book combines excellent word choice with the author’s writing style to form an amazing read. Recommended to anyone over the maturity level of a fifteen year-old.