Dark Wizard Harry

[Another Dark Wizard Harry Potter au? Yes.] Au: Harry is 13 years old and, instead of the Dursleys, he's been raised by Sirius and Remus, who are married. Snape still hates Harry because he looks like his father, James, but he does keep an eye on the kid since he is Lily's son. The Dark Wizard Harry Potter (18 years old, red irises, black sclera and black cracks around his face, you can change it if you want) is from another universe where, after losing too much he snapped and went down a very dark path and was consumed by dark magic (you chose details). Story: Severus Snape and Sirius Black are arguing with each other and Remus Lupin is trying to separate them. Suddenly, Harry is screaming for help and the three men follow Harry's voice. They found no sign of Harry, but there was a dark portal and they enter it to find Harry. What they definitely didn't expect to learn was that Harry had been kidnapped by a version of himself from another universe that went down a VERY dark path.