Thor (1966) #439
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It is unknown how Stellaris survived the extermination of her home world by the Celestials or how she acquired her living armor, but ever since she has committed herself to their destruction.
As the Norse God of thunder and lightning, Thor wields one of the greatest weapons ever made, the enchanted hammer Mjolnir. While others have described Thor as an over-muscled, oafish imbecile, he's quite smart and compassionate. He's self-assured, and he would never, ever stop fighting for a worthwhile cause.
Hela was born ages ago to the being who would one day be called Odin and a goddess whose name and image have been lost in antiquity. On the day of her maturity, Odin appointed her goddess and ruler of the northernmost realms of the dead. Her special dominion was over the souls of all who did not die in battle, while Odin himself built the palace Valhalla to house the souls of all of those who died as heroes. In recent years, when Odin’s attention had strayed from the maintenance of Valhalla, Hela tried to annex that realm to her own, hoping to consolidate her power over all Asgard’s dead. Eventually Odin grew aware of her ambitions and opposed them. In the course of battle, Odin’s band of Valkyries, the custodians of Valhalla, lost their physical forms, no longer able to travel from Valhalla except in their wraith-like astral forms. Hela gave up her contest for Valhalla when Odin vowed to keep better watch over it in future, and she returned to her realms.