Rending Slashes is a skill located in the Dual Wield (which can be found in the Weapon skill tree). Rending Slashes is a morph of Twin Slashes
Rending Slashes 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, Thaumaturge. Also the following red champion point trees protect against this skill: Hardy, Iron Clad, Thick Skinned.