Elysius is an artificially created being constructed by the Titanian super computer ISAAC, and possesses some of the superhuman attributes of an Eternal from Titan.

Elysius debuted in Captain Marvel #59 (Nov. 1978), created by writer Doug Moench and artist Pat Broderick.

[4] She accompanied Betty Ross, Rick Jones, and Fred Sloan to Gamma Base in search of Mar-Vell and the Hulk.

[6] Elysius is an artificially created being patterned on and possessing some of the attributes of the Titanians, a lesser sub-branch of the long-lived offshoot of humanity called the Eternals.

ISAAC crafted her personal sky-ship, which resembles an ancient Earth galleon but possesses the capacity of flight.