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It isn't really clairvoyance or precognition. From what I understand, from what my dreams have told me, its a curse. I'm not shown how a person dies, only what time does to them physically. I wouldn't be able to look at you and see that you would die from a car crash in 10 years, for example. You would look old, haggard, withered and skeletal, as if you were the walking dead.
It is my hope that those in the magical community would know something about lifting the curse. I understand that there are those with experience in curses.