Nidhoggmon

Nidhoggmon is a Dark Dragon Digimon. It is a colossal Digimon that takes vast amounts of energy into its body, and is constantly overheating. The color emitted by its wings represents the extent of its overheating; the more it approaches the danger level, the redder it becomes. It repeatedly destroys and absorbs things, leaving nothing behind in its wake.

 Attacks: 
 * Annihilention: Red-hot beams fired from its eyes.
 * Rudiment: Condenses the energy within its body, and breathes it out of its mouth as a wave.

Design
Nidhoggmon is a colossal, serpentine Digimon with purplish-gray skin and boomerang-shaped head similar to that of. Its body and tail glow with incandescent heat peaking through openings in its skin. Nidhoggmon has three claws on each hand, along with two pairs of forked wings, five pairs of glowing red eyes, and a mouth full of jagged, sharp teeth.

According to Kenji Watanabe, Nidhoggmon is so big, its tail would extend from to.

Etymologies
Official romanization given by the Digimon Reference Book and used in the franchise.
 * Nidhoggmon (ニーズヘッグモン)
 * . A mythological dragon/serpent from.