Death Phantom

The Death Phantom is an extremely rare monster that spawns in the Dungeon after Plantera's defeat. When it spawns, it will begin moving horizontally through walls toward the player. It will kill them upon contact unless they turn and look in its direction for at least 2 seconds. This will cause it to dissipate, not dropping anything. It cannot be killed. Dying from the Death Phantom will give the unique death message " didn't look back."