Irnakk

"As you know, all of the beings now known as Piraka are from the same species and originated on the same Island (though they are scattered about in many places these days). As with any culture, they had their share of myths -- figures of good, figures of evil, figures that might exist and figures that couldn't and shouldn't.

"Irnakk falls into the category of 'things that should not' --he's a figure of nightmare, tales of which the rulers of that species' island use to keep their people in line. In the same way the Turaga used tales of the Toa to fill their people with hope, the rulers of this species used tales of Irnakk to fill their people with terror.

"When the Piraka get closer to the Kanohi Ignika, they encounter an area in which this figure is drawn from their nightmares and made real. The Piraka, beings who inspire fear, must face their own horror if they want to reach the mask"