Mystic Eye's in Remnant

Y/N L/N was a normal guy living in Vale. That is until he found a broken knife and upon touching it his mind was instantly clouded by someone else's memories. But not only that he also gained someone else's voice in his head. AND NOT ONLY THAT he also gained a different pair of eyes.The "Mystic Eye's Of Death Perception". A pair of eyes that you guessed it allowed him to see death via red lines on the persons body. Once said red lines are cut the person dies.
The only thing AU would probably Pyrrha doesn't die

And now because of these abilities his dream of becoming a Huntsman can now be a reality.

Also Note i've never seen Garden Of Sinner's so if any information of the Mystic Eye's is wrong please correct me.