Soaring through space, Dominas helped Galactus absorb both the Shi'ar Empire and Asgard. Later, Dominas fought the mighty Thor and helped Galactus capture both him and the Odinsword. Dominas met his fate when the Silver Surfer, a former Herald of Galactus, received word about his former master's insane plans. The two Heralds fought each other, with the Surfer winning and destroying Dominas. However, the Surfer did absorb Dominas' cosmic power to help him defeat Galactus.
Dominas possesses use of the Power Cosmic, granting him super-strength and nigh-invulnerability. Aside from these, and the various other energy related powers, Dominas seemed to specialize in manipulating waves since he rode on waves of energy through space and created a wave of water to destroy New York. The level of his power cosmic appears to be higher than previous heralds since he was able to defeat Thor wielding the Odinpower and destroy a large section of the moon. His lack of experience allowed his powers to be absorbed by the Silver Surfer.