Frostspear

are NaN Items in.

Location and Uses
Frostspears are magical NaN Weapons forged with ancient Ice from the Hebra Mountains. They're found not only among those mountains, but in BotW: as well, particularly around Hyrule Castle. When the blade glows blue, any attacks will freeze your enemies. Equipping a Frostspear in a warm climate will also grant BotW: one level of Heat Resistance.

One of the weapons Nebb asks to see during the BotW: "The Weapon Connoisseur" is a Frostspear. If Link shows him a Frostspear, Nebb will be excited and give him a Gold Rupee as a reward.

Frostspears are made of metal. As a result, they will sink in water and attract Lightning, but they can't burn and can be manipulated using the Magnesis Rune.