While Captain Marvel is empowered by six mythological and Biblical figures, Ibac is empowered by four of the most evil and terrifying men to have ever walked the earth: Ivan the Terrible, who supplies Terror, Cesare Borgia, who gives Ibac Cunning, Attila the Hun, who gifts him with Fierceness, and Caligula, the sponsor of Cruelty. While Captain Marvel transforms using magic lightning bolts, Ibac's transformations are accomplished with the power of mystical green fire and brimstone. This also gives him superhuman strength and stamina. In his second appearance in Captain Marvel Adventures #9 Beautia Sivana saying 'Ibac' next to Ibac after his transformation transforms her into a black haired woman wearing a black dress, though she still has her own personality and turns back when saying 'Ibac' again. In Justice League of America #135 (October 1976) Ibac is one of the villains of three Earths working for King Kull. Spy Smasher battles Ibac, and is on the verge of losing when he remembers what Captain Marvel told him of the villain. Spy Smasher then taunts the dim-witted villain, telling him to "back down". Ibac responds proudly: "I back down for nobody!" The phoenetic "I back" causes him to revert to Stinky Printwhistle's form. In "Shazam" #29 (May–June 1977), his original benefactor Prince Lucifer gives him greater power briefly, but he turns back on purpose to escape the affections of villainess Aunt Minerva after getting advice from Solomon.