Ah, I seem to have muddled it up for you, apologies!
I meant, in a world without magic, there is a virtual reality game called 'Witches!' where the characters of Harry Potter, muggles as can be, take the identity of those of a fictional group called Death Eaters and basically, the goal of the game is to be as 'bad' as can be, as the world is ruthless in that game and they need all the tools they can get their hands on. Now, what would happen if, in this AU, the Death Eaters are in fact only fictional game characters?
How will this change the teenaged cast we will use? As they will do pretty rough things to get stronger in the game, and this may affect their psyche...