Ice Furnace is a light armor set. When you deal direct damage with a Frost Damage ability, you have a 50% chance to deal an additional 997 Flame Damage to all enemies within 8 meters around the initial target. This effect can occur once every 1 second.
The Ice Furnace set is part of the base game. It drops in Direfrost Keep in Eastmarch. Each set item is bound on pickup. You can acquire light armor, weapons and jewelry of this set in the Clockwork motif style.