Prototype Two Tails

Prototype Two Tails (ニ尾, Nibi), is one of the Prototype Tailed Beasts.

Appearence
The Two Tails is a gargantuan, mastodonic Dragon whose entire upper body is covered in black, round, scales, which, in turn, are decorated by spiraling, blue markings. His lower body, specifically his belly, inner tail, and legs, are gray in color, and appear to be rather smooth. The Two Tails' eyes are white and beady, and his head is round and blunt with four, large, elongated plates extending backward. Acnologia's mouth is full of razor-sharp teeth, and, attached to his chin, is a protrusion that resembles an arrowhead. His large wings are feathery in appearance, akin to a bird's and has two Dragon-like Tails.