Arctic.

Ouranite, Uncommon

Found in the deep tundra or on the highest mountain tops where the spring thaw never reaches, Arctic Ouranite takes the form of floating shards of light-blue ice that chills to the bone when touched. Once refined, it takes on an intense dark blue hue and sky-blue marbling. The aforementioned chill becomes significantly more intense, being described as what it feels like to jump into an icy lake. The remote regions this ouranite is harvested from make it fairly rare anywhere, but even more so in warmer climates like Kaldar.

• Armor – Your armor is always pleasantly cool, even in the warmest of climates. You do not suffer negative effects of warm weather conditions, and you gain damage reduction 10 to cold damage.
• Weapon – Your weapon deals an additional 1d12 cold damage.
• Other – When activated as a bonus action, this ouranite creates a 20 ft. aura that deals 10 cold damage per round to all creatures in range. This effect may be ended as a bonus action.