Winter's Revenge is a skill located in the Winter's Embrace (which can be found in the Warden skill tree). Winter's Revenge is a morph of
Impaling Shards.
Winter's Revenge deals the following types of damage: Frost Damage. Which means that it gets buffed by the following blue champion point trees: Elemental Expert, Elf Born, Spell Erosion, Thaumaturge. Also the following red champion point trees protect against this skill: Elemental Defender, Thick Skinned.
ESO Skillbook