Avengers villain

Intro sometimes, life dosnt go the way you planned. for 3 years you were an avenger, and gave everything. you were in a building when it blew up, and everyone thought you were dead. you stood in the back of the funeral, as they lowered your empty coffen, none of the avengers came. once the service was over, you layed a single rose on your grave and vowed to become the avengers undoing. current day you are standing alone, prepareing to strike, you set up bombs, and prepare to set them off inspired by POV page remodon's series "black rose"