Hakuroumon is the fourth Armor form attained by Hakumon. Hakumon armor digivolved through the Digi-Egg of Friendship, leading it to assuming the form of a wolf. Hakuroumon lives in the coldest regions of the Digital World. It was able to survive such harsh conditions that it adapted to be able to control the cold weather around it. Hakuroumon always hunts in a pack, allowing it to take down prey as large as Mammothmon. A blue flame appears on its forehead, the signature of Hakumon’s line.
After discovering the Digi-Egg of Friendship, Matthew and Brittani both used it to Armor Digivolve their digimon to combat the "fake" Armor digimon Volatilemon used to guard it. They were all defeated by an attack from ThunderGreymon and Hakuroumon, prompting the DigiDestined to worry about why they were so easy to beat. ThunderGreymon suggested that they shouldn't worry because it wouldn't be difficult to get the Digi-Eggs back if all the guard digimon were like this. Brittani then rode on Haku's back to the Village of the Ancients.
Haku Freeze- breathes a gust of frigid air at the opponent, freezing them in place
Blizzard Vortex- summons a whirlwind of icy weather, varying from snow to hail to sleet