The Order of Ixis was an ancient society of sorcerers that originated many centuries before the birth of Sonic the Hedgehog, roughly 9,700 years ago.
Founded by Ixis Mogul, who developed much of the Order's knowledge as he gained increased understanding of his Chaos abilities, the Order soon drew other beings who were interested in obtaining power through the natural forces on Mobius. Eventually, this group became involved in a war with the Albion Knights of Aurora known as the Forgotten War, which ended with the Order's defeat and destruction. This was partly because the Knights forsook their code of valor and resorted to using any means necessary to stop their enemies. This was reported to Mogul by one of the Four Elite-the highest ranking mages in the Order-Ixis Vale. At the same time, Mogul contemplated the creation of what would become one of the order's most powerful spells known as the Eldritch Rites: a technique that could bend the minds of others to the will of it's user. Despite his efforts and the use of Mutates by both sides, the war ended with the Ixian defeat. (StH: #163; SU: #43, Saga #2)
Only four members managed to survive: Mogul, Agunus, Nusgau and Suguna - the latter three wizards eventually merged and became Ixis Naugus. Naugus would later join forces with Mogul, prompting goodly magician Merlin Prower to state that the Order of Ixis had returned; however, with their subsequent defeat and time in the Egg Grape Chambers, Naugus was left bereft of his Ixis Magicks, leaving the Order reduced to a single member and thus defunct once again. (StH: #66, #162, #163, #164, #168)
Later, with the aid of Geoffrey St. John, Ixis Naugus managed to regain his sanity. It is also revealed that St. John possesses novice-level Wind Magic, making him a member of the order as well. The pair subsequently convinced the people of the city to accept Naugus as their king. As a result of Dr. Eggman's Genesis event, Naugus' three component Ixians returned and began tormenting him from within, seeking to gain control. Eventually he created an Ixian Ritual Chamber and had Geoffrey recover the bones of Ixis Vale in preparation for a monstrous plan. Using Mogul's enslavement spell, he would bring all of New Mobotropolis under his control and recreate the Order. However, his plan ultimately failed due to the efforts of the Secret Freedom Fighters. (StH: #222, #223, #224, #231, #232; SU: #41, #42, #43, #44)