You Poor Unfortunate Soul, this "Thread of Life," has been found to need Ursula’s Touch. It MUST be rewritten, see the light, and make a switch!! So says Ursula: the true queen of Atlantica.
The Thread of Life is the representation of an individual's soul within the Skein of Fate; usually depicted as a string of various lengths; the Skein and all the Threads of Life are woven, measured and sut by the Fates. Whereas mortal Threads are vulnerable to Fate and are dull black, Threads of the Gods are not subject to the Fates and are glowing gold. Emphasizing this, and the scope of the Fates, when the Fates are first seen, they have a Thread of Life which they cut, effectively terminating the life of a mortal woman (her "fate"), and making the population of spirits in the Underworld 1,000,001. Later in the film, the Fates are again depicted as honoring their role in the greater tapestry, by cutting Megara's Thread of Life after she is crushed under a pillar and dies from her injuries. In their final appearance of the film, the Fates once more bring out a Thread of Life, this time the protagonist's, Hercules', as he dives into the River of Styx to save Megara's spirit; however, when they try to cut the thread, it transforms from black (mortal) to gold (God) as Heracles regains his deification for his willingness to sacrifice himself for another's life. This turn of events shocked the Fates, contradicting what they said earlier when they said they knew everything.