Icebane Leggings

Icebane Leggings are quest reward plate leggings that give a bonus to strength, stamina and frost resistance.

Source
Icebane Leggings are quest reward from for the quest The Only Song I Know... if they have completed the quest Echoes of War. Wilhelm will make you this item if you supply him the components.

The components are:
 * 2 Frozen Rune
 * 2 Blue Sapphire
 * 2 Essence of Water