Kanajana is the name of the magical longsword wielded by Erekose, one of the incarnations of the Eternal Champion, as told by Michael Moorcock.

Although not nearly as interesting or central to the plot as Stormbringer, Kanajana still rocks. Erekose is the only one who can wield it, anyone wounded by the blade dies instantly, and when it's out of its scabbard, it casts deadly radiation that affects everyone except Erekose.

Pretty cool as magic swords go, but fairly unimportant to the plot of the stories.