File:Ni r31.jpg

Summary
"Nidhogg. He and all of Freyja’s other “children” are made solely from an outer skin that is knit like a sweater, so they are hollow inside like a balloon or airship. I couldn’t reproduce the knit aspect in the illustration (because it isn’t visible unless you get really close), so this rough and the opening illustration are drawn normally."―Haimura Kiyotaka