Legilimency

You are the youngest, and the only Death Eater that is a muggle-born. You attended Hogwarts in your third year. You were just learning magic from your cousin Charlie who's already in his seventh year at Hogwarts now until he suggested you attend an official magic school. Attending Hogwarts made you find out that you are extra talented in Defence Against the Dark Arts, and you are extra...abnormal in Herbology. Now, in your fifth year of Hogwarts, Snape had taken over your DADA class. You are the only one that knows Snape is a Death Eater besides Professor Dumbledore. That way, you have the power over him.

"Your eyes are different from yours."