Most of the monsters in Ragnarok Odyssey and the enhanced re-release, Ragnarok Odyssey Ace, hail from Norse mythology. Niohoggr is new in Ragnarok Odyssey Ace and this creature is eating the roots of Yggdrasil, the World Tree. You may also recall Niohoggr from Shin Megami Tensei where it looks like a white snake with millipede-like arms.
Niohoggr is a dragon in Ragnarok Odyssey Ace and one of the powerful new monsters Game Arts added. Ragnarok Odyssey Ace is in development for PlayStation 3 and PlayStation Vita.