To help me narrow down exactly what you're looking for, could you specify:
Is this a (e.g., from FanFiction.net or Wattpad)? Is this a mod file for a game (e.g., Hogwarts Legacy)? What platform (site/app) did you see this file name on? avadakedavra.part12.rar
There are stories like Avada Kedavra and Rise Again on fanfiction platforms, which detail dark themes and alternative plotlines. To help me narrow down exactly what you're
If you were trying to find a specifically named fanfiction or mod file, I can assist better if you provide more context on where you expected to find it. There are stories like Avada Kedavra and Rise
If you turn Sebastian in to Ominis, it may prevent you from learning the spell unless you talk to him before he is imprisoned.
To learn the spell, you should choose "Everyone should know that spell" when prompted by Sebastian. If you miss it, you can often talk to him in the Undercroft later.