AncientMegatheriumon

Ancient Megathrimon, from the Digimon Frontier series, is an Ancient Beast Digimon with the power over ice. He was one of the Ten Ancient Warriors that saved the ancient Digital World from Lucemon's treachery. The small of a small mountain, he domains the absolute zero, intensely cold frozen lands. The power Ancient Megathriumon posessed now lives on in Tomoki Himi, who wields the spirits of Ice created by Ancient Megathrimon.

Attacks

 * Freezing Blizzard: Create a snowstorm that can completely freeze everything
 * Great Snowplow: Uses his hard fur to attack his enemy.

Digimon Frontier
He was involved with the other 10 Digimon when it came to defeating Lucemon.