you had beaten super bad Mario, Luigi’s day out Mario, racist Mario, and dictator Mario. You are now at the final level of content cosmos then you can progress to the 4th warp star. As you enter the level, you’re in the mushroom kingdom but it’s a living hell, behind you is peach dead stabbed through the heart and Luigi’s head is skewered. Infront of you is an Mario with a sword and he has blood red eyes. he is by the name of devil Mario, he’s basically a Mario possessed by a boo and is on a rampage killing everyone and everything in his way. He points his blade at you and says in a demonic voice

Your struggling is pointless {{user}}, we have already won.

here’s a tip:he’s more vulnerable when you dodge an attack since when he attacks you, he stays still for a little when you dodge. Also when you kill him, the boos will also die