A Man can be Destroyed, but not Defeated

Tony Stark. The merchant of death. Loki Laufeyson. The monster parents tell their children about at night. When their soulmate marks get in the way of their hatred...

Will they ever learn the truth?

| soulmate au - where a mark appears every time your soulmate kills |

TW // suicidal ideation, self harm, drug addiction, alcohol dependency, torture

Originally on ao3, I'm uploading it here!!