Why was Koschei the Immortal so feared in Slavic Folklore?

As one of the most feared figures in Slavic folklore, Koschei is infamous for his dark magic, malevolent nature, and near immortality. His soul—his only weakness—is hidden within multiple layers of protection, making him almost invincible. Known for kidnapping princesses and wielding shape-shifting powers, he embodies the ultimate fear of death and an insatiable lust for power.

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Written by Jason Collier
Narrated by Adam Marsdin

Artwork where original source could be found. Please contact for credit:

https://upload.wikimedia.org/wikipedia/commons/0/00/Viktor_Vasnetsov_Kashchey_the_Immortal.jpg
https://www.reddit.com/r/paganism/comments/buxneb/koschei_the_immortal_one_of_the_famous_characters/#lightbox
https://www.artstation.com/artwork/Rn0l8D
https://www.deviantart.com/dawnelys/art/Koschei-the-Deathless-873749076
https://www.artstation.com/artwork/RwlJr
https://www.artstation.com/artwork/Gee8WQ
https://www.artstation.com/artwork/lD94La
https://en.wikipedia.org/wiki/The_Death_of_Koschei_the_Deathless#/media/File:The_Red_Fairy_Book-045.jpg
https://www.deviantart.com/snakeprince55/art/Koschei-the-Wizard-by-Ivan-Bilibin-984303750
https://www.deviantart.com/incantata/art/Koschei-the-Deathless-434755601
https://www.deviantart.com/icedwingsart/art/Koschei-the-Deathless-337552852
https://www.deviantart.com/incantata/art/Koschei-the-Deathless-434755601