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