His appearances seem to be erratic, following no pattern, other than appearing in the Far Shiverpeaks.
One spawn location is near the southern tip of the Drakkar Lake, but it is rare.
Due to only having Warrior skills, it was once believed that he was a Warrior boss that mistakenly had the green Necromancer aura. However, he gains energy from Soul Reaping, which proves that he is indeed a Necromancer primary.
Its name is likely a reference to Jörmungandr (the Midgard or World Serpent) from the Norse mythology.