Crushing Shock is a skill located in the Destruction Staff (which can be found in the Weapon skill tree). Crushing Shock is a morph of Force Shock
Crushing Shock deals the following types of damage: Flame Damage, Frost Damage, Shock Damage. Which means that it gets buffed by the following blue champion point trees: Elemental Expert, Elf Born, Master at Arms, Spell Erosion. Also the following red champion point trees protect against this skill: Elemental Defender, Iron Clad.