 This oath entitled that each dragon would go into a deep hibernation until the current king, wearing the Belt of Deltora, would come to them and awaken them.Once awakened, they must also never to use the other dragons' hibernation to their advantage to invade their lands.In present day, Lief went to each of the dragons' lands and awakened them one by one and calling upon them for assistance in destroying the Four Sisters, for dragon fire seemed to be the most efficient weapon against the Shadow Lord's magic.