From the Super Mario Wiki
The Dark Longator is an enemy from Super Paper Mario that can be found in rooms 23 and 88 of the Flopside Pit of 100 Trials. It appears as a shadow version of a regular Longator. It attacks by stretching its head out to extreme proportions, reaching the player from a long distance away. However, this makes the now-very-wide enemy easier to step on. A Dark Longator's head can go through the black blocks in the Pit.
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