History
Magus City was a sanctuary created by Adam Warlock, who used the power of the Soul Stone to keep the Annihilation Wave at bay, specially a giant behemoth he had under his control in the underground. Warlock additionally used the Soul Stone to influence the actions of every inhabitant of Magus City, transforming them into a collective that got bliss from doing whatever he wanted.
When the Bakian Clan and their allies traveled to Magus City to retrieve the Soul Stone, the ensuing fight resulted in Warlock's death at the hand of the Bakian's ally-turned-enemy Thanos. Warlock's death caused the giant behemoth to break loose and wreak havoc throughout the city.[1]