In the fourth installment of the action-packed Guardians of Horsa
graphic novel series, the Guardians venture to the Fire Realm.
The Guardians seek a hidden relic inside the Fire Realm, but there's no
warm welcome waiting. Instead, the horses learn of the Fire Oath, a
promise Gamma Ray made as prince of the Solar Herd to protect his realm
at all costs...even turning against the Guardians.