I was looking for a fic where Theodore Nott, Draco, and some other people were freshly recruited Death Eaters. They were still in Hogwarts, but most knew or had a feeling that they were radically pure blooded/affiliated with Voldemort. But even though people see Draco as the leader, Nott is the one doing most of the work, aka doing really dark spells aka pure evil aka pretty bad-ass.

This fic isn't Slytherin-centric, but this is the most that I know about this story. I'm sorry that I don't have more information, but I don't want to say something about this story that isn't true. I have read so many fics that they all get mixed up in my head and it's hard to differentiate them from each other.

Thanks!

 

Renegade Cause?

 

Seems the most likely answer. Renegade Cause