Mutkifer

Mutkifer is an entity resembling a faceless Mario made by Whitevoid

Biography
Mutkifer appears as the main antagonist of Crucis Mortem, having seemingly corrupted the Super Mario Bros 2[E] rom emulated by the player.

He first appears partway through World 1-1, grabbing Luigi with one of his disembodied hands. Mutkifer is then seen facing away from the player, turning his head to look at them after several seconds. At the end of World 1-1, Mutkifer gives a monologue before grabbing Luigi and crushing him between his hands.

Mutkifer can briefly be seen peeking from the ceiling after the second door in the cave area, quickly retreating into the ceiling after becoming visible. He gives another monologue at the end of the cave, taking credit for the current state of Toad and promising that things aren't over, before slamming his fist into the bridge Luigi is standing on to send him falling.