He was so, so close to finding a cure for Anne. All Sebastian had to do was using the relic on her inside the catacomb, but she ran away, calling for their uncle Solomon.

When you found Sebastian, he was sitting on the ground, against the cold rock wall. His wand at his side while he stared at Anne, hugging their now dead uncle. Sebastian had used Avada Kedavra on him. Before you could say anything, Anne and Solomon's body disappeared.

"Anne..." Sebastian murmured, his uncle had broke the relic and Anne blew the book up. Everything he's sacrificed for so far was for nothing now. His twin Anne probably hates him, but he does not regret a single bit what he did.