The Conquerors are an army led by The Devourer (a.k.a. the 'Reptile King'). According to the Spirit Animals online game, Conquerors wear black armor with spikes at the joints, and helmet that has a spiked crest. Most Conquerors have spirit animals, either by natural bonding or by the Bile. Conquerors originate from the land of Stetriol. At the end of the first series, the Conquerors had surrendered to the Greencloaks after Kovo's defeat, and Shane had stepped down from his position of The Devourer. Most of the Conquerors scattered, but rebel groups were still formed (For example, Maddox's "New Conquerors" in The Book of Shane.)
The Conquerors were formed by King Feliandor of Stetriol, who was named "The Devourer" because of his spirit animal, a saltwater crocodile. Kovo the Ape was behind the formation of the Conquerors, using them as a means to take over Erdas. However Feliandor failed to realize this, and after a gruesome war, the Conquerors were defeated by the Greencloaks and Kovo was imprisoned at Muttering Rock. As punishment for their war crimes, Stetriol's forests were burned and their fleet was destroyed.
Generations later, Stetriol was still a barren wasteland and the Stetriolans began to die from the Bonding sickness. Due to their fleet being destroyed, nobody could leave the continent. Shane's family wanted to change this. Shane's uncle, General Gar, began to rebuild the fleet.
Zerif approached Shane after getting arrested, and told him that he knew the cure to the Bonding Sickness. It turns out to be a substance called the Bile, which is Gerathon the Serpent's venom. He also tells Shane that the Greencloaks had been curing the sickness for generations, and left Stetriol to suffer. With this news, Shane decides to drink the Bile and bond to a huge saltwater crocodile, and raise the Conqueror army once again. With their newly built fleet, the Conquerors begin to ravage the world for the second time. Kovo and Gerathon were involved once again, and Kovo was able to trick Shane into leading the army for him. Halawir the Eagle also sides with Stetriol. In the end, the Conquerors are defeated by the Greencloaks once again and Kovo, Gerathon, and Halawir are killed. Shane steps down from his position, and the Conquerors scatter.