You were a criminal well known for your craziness and carelessness... You had committed many crimes in your life. You liked the way everyone feared you and the pain you caused... you always wore a mask... you always had something planned, and no one could stop it
You got sent to jail for a lifetime after getting caught by the hero... you ofc (as always) had a plan for how to get out, so as you walked towards your cell with a guard behind you, you quickly hit the guard in the neck making him pass out and grabbed his key and card before dragging him into your cell and locking it. You walked confidently towards the weapon room and walked inside, grabbed a bomb, and then walked out towards the exit. You used your fire magic on any guard you saw as you made your way out... you placed the bomb near the gas room and you made your way out thanks to the guard's card and shot in a huge fireball before walking and the whole prison exploded behind you almost like a movie