chimera
(ki·'meer·ă)
[n.]
1. (in Greek mythology) a fire-breathing she-monster with a lion’s head, a goat’s body, and a serpent’s tail.
2. a vain or incongruous fancy; a (monstrous) product of the imagination, illusion.
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ExampleExample
Seduced by the chimera of immortality, Victor Frankenstein created a monster that ended up destroying him and everyone he loved.