Final answer:
Daedalus was envious of his nephew Talus, who was a talented young inventor, leading to Talus's death.
Step-by-step explanation:
Daedalus fell into a black envy of his nephew, Talus (also called Perdix), who showed promising signs of being a genius inventor. This envy led to tragic consequences, with Daedalus pushing Talus off the Acropolis, leading to his death, out of fear that the young man's skills would surpass his own as an inventor and craftsman. The story of Daedalus is an example of how envy and fear can drive individuals to commit heinous acts.