Biting Jabs is a skill located in the Aedric Spear (which can be found in the Templar skill tree). Biting Jabs is a morph of Puncturing Strikes.
Biting Jabs 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, Thick Skinned.