A figure from Slavic folklore, Koschei the Deathless (aka Koschei the Immortal) was known for his titular characteristic: his inability to die. What is most interesting about this figure, however, is that his immortality was not foolproof. It was said that when Koschei cast the magical spell to protect and defend himself, he accidentally left room for error.
Though there are few records about his physical appearance, in legend Koschei is most often described as ugly. It is also said that the immortal being enjoyed riding naked upon his enchanted horse through the mountains of Russia.
Koschei the Immortal was also known as a shape-shifter, sometimes seen as either a monster or a human, but he preferred to kidnap his female victims in the form of a whirlwind tornado. The most important aspect of the mythical Koschei’s being, however, was his absolute terror of death. This fear left him open to making mistakes, and his most fatal mistake was the imperfect spell he cast to protect himself from harm.
Kashchei (Koschei) the Immortal (1917–1928). (Public Domain)