Crushing Weapon is a skill located in the Psijic Order (which can be found in the Guild skill tree). Crushing Weapon is a morph of Imbue Weapon.
Crushing Weapon deals the following types of damage: Physical Damage. Which means that it gets buffed by the following blue champion point trees: Blessed, Master at Arms, Mighty, Piercing, Precise Strikes, Quick Recovery. Also the following red champion point trees protect against this skill: Hardy, Iron Clad.