 He also made them promise not to take advantage of the other dragons' hibernation and not to invade their territories.After the dragons went into hibernation, Doran found out that the dragons were an obstacle to the Shadow Lord's plan to plant the Four Sisters throughout Deltora and by having the dragons go into hibernation, Doran had removed this obstacle once and for all.Doran then drew a map to where the Four Sisters were located and asked the map to be delivered to the king, but the people of Deltora thought he was crazy and his map was torn into four pieces, each piece marked with the Shadow Lord's brand.