Sedenach is a planet, home to the Bismuth Mountains.


Kara Zor-El and her parents would spend their solstices on Sedenach. At one point, Kara visited the Bismuth Mountains and got to see their crystal staircases.

Mon-El once took a girl to Sedenach, presumably for romantic reasons.[1]

Thomas Coville somehow found a sample of Sedenach dust on Earth, which was used by his acolytes to make a Worldkiller.[2]



Season 2

Season 3


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