Diarn is an enemy from Mega Man 9. It is a floating robot with an armoured diamond shell.
Diarns fly towards Mega Man for a second, before stopping to open their shell and fire a single shot aimed at him. After firing, they hide back inside their shell and pursue Mega Man again. While hiding inside their shells, Diarns are immune to all non-piercing weapons, but are otherwise very weak.
By default, Diarns are green, but by setting "col = 1" in a Diarn's creation code, they will turn pink.