Stormbringer is the name of the infamous black sword featured in a number of fantasy stories by the author Michael Moorcock. Created by the forces of Chaos, it is described as a huge, black sword covered with strange runes carved deep into its blade. It is wielded by the doomed albino emperor Elric of Melniboné.
This powerful enchanted black blade is a member of a demon race that takes on the form of a sword, and as such is a force of Chaos. Stormbringer's edge is capable of cutting through virtually any material not protected by potent sorcery, and it can drink the soul from (and thereby kill) an unprotected human upon delivering any wound, even a scratch. Its most distinctive features are that it has a mind and will of its own, and that it feeds upon the souls of those it kills. Elric loathes the sword but is almost helpless without the strength and vitality it confers him.
Stormbringer’s hunger for souls is such that it frequently betrays Elric by creating a bloodlust in his mind, turning in his hands and killing friends and lovers. The cursed nature of the sword adds to Elric’s guilt and self-loathing even as he feels pleasure when the stolen lifeforce enters his body.
Stormbringer has a "brother" sword named Mournblade, which was at one time wielded by Elric’s cousin and enemy Yyrkoon. It is identical to Stormbringer in most regards. Later stories reveal that there are thousands of identical demons, all taking the form of swords. Three such sibling blades appear in The Revenge of the Rose and many more "brother blades" are seen in the novel Stormbringer, but only Mournblade and Stormbringer are named.
In Elric of Melniboné, Elric and cousin Yyrkoon find the runeblades in a realm of Limbo and commence battle. Elric and Stormbringer disarm Yyrkoon, and Mournblade disappears. Yyrkoon is defeated, and Elric and his cousin return to Imrryr.
In The Weird of the White Wolf, Elric returns to Imrryr after a long journey and confronts Yyrkoon, who usurped the throne in his absence. Yyrkoon has regained Mournblade through unknown means and uses it to attack. Elric and Stormbringer kill Yyrkoon, and no further mention is made of Mournblade until it is later disclosed that it was recovered by the Seers of Nihrain, to be wielded by Elric's cousin, Dyvim Slorm. Imrryr is sacked, though the pillagers' fate is not much better, being pursued by the golden battle barges and the few dragons who were awakened, led by Dyvim Tvar. Only Elric's ship escapes, propelled by the aid of his sorcery.
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