The Magus was the ruler of Kvch, homeworld of the Technarchy, and its most powerful being. When his son Warlock fled their homeworld, due to his fear of having to face his father in mortal combat, the Magus pursued him to Earth in order to kill him, arriving on Earth the following winter in the form of a meteorite impacting near the X-Mansion. Only three X-Men (Colossus, Nightcrawler, and Rogue) were then on the mansion grounds to oppose the Magus, yet still inflicted upon him a painful and humiliating setback which prompted Magus to hide himself on Earth in human guise in order to study the mutants of Xavier Mansion incognito. Magus eventually did battle with Warlock and his New Mutant teammates resulting in Magus being sent back to his point of origin.
Deep in space, Magus met the New Mutants again. Assisted by the Starjammers and Professor X, the Magus was "reprogrammed" into reverting to an infant state. He later returned to normal and sought out his son. He confronted a new version called 'Douglock', which was not exactly the entity he expected. A combined force consisting of several Avengers, Wolfsbane, and two newer super-powered people, Hope and Psimon, confronted him during his attack on New York. Magus was defeated when Douglock combined his abilities with Hope's matter-transformation powers and was thought to have returned to his home planet.
The Magus decided to avoid conflict on Earth, considering that many high-powered entities were interested in it (such as the planet devouring Galactus). Instead, Magus chose the extradimensional Limbo as his battleground, and infected S'ym, the demonic henchman of New Mutant Magik, with the techno-organic virus. Magik defeated S'ym's revolt, and the New Mutants battled Magus alongside the space pirates Starjammers. In this battle, Cypher managed to decode Magus' genetic structure, and devolved him into a Technarchy youth. The Magus was then sent back to the Technarchy homeworld to be reared once again.
It was revealed that although Warlock had defeated and seemingly killed his father many years ago, he was very much alive and looking for revenge. Warlock himself had however gone through a rough time period in which he was almost killed. He had regrouped himself and now had a more human-like appearance, looking a lot like his murdered New Mutants friend, Doug Ramsey. Magus attacked his son again and, though Magus was extremely powerful, Warlock had grown wiser over the years and was capable of defeating his father with the help of the Avengers. It seemed Magus was defeated for good.
The mutant-haters, the Purifiers, discovered the Magus in a state of hibernation on the ocean floor. Bastion collected the Magus' spawn and used the Transmode Virus to resuscitate and transform long-dead enemies of the X-Men into the members of the Human Council. However, they were all eventually defeated by X-Force.
Eli Bard stole the techno-organic virus from the Magus' spawn, apparently killing it.
Later X-Factor, now a privately owned and operated super-team handpicked by Serval Industries' CEO Harrison Snow, investigated Techno, Inc., a high tech organization rival to Serval Industries. X-Factor unexpectedly discovered that Magus was once again on Earth and heading up the corporation. Not only that but Magus' previously estranged son, Warlock, was now on his side. With the help of Doug Ramsey, they confronted Magus, who revealed that after the fight with his son where he ended being infected with a virus, he tried to reboot and rid himself of the virus when he reached his planet. However, the virus broke free and infected all the Technarchy and laid waste over the planet with only a handful of Technarchs having survived. On the verge of extinction, Magus decided to make amends with his son, setting aside the race's genetic disposition of father killing son so that they could live in harmony. Presented with the fact that Magus was only merely running his own corporation and not doing any harm, X-Factor was forced to leave.
Under unknown circumstances, Magus was murdered by Nimrod.
