Shadow Silk is a skill located in the Undaunted (which can be found in the Guild skill tree). Shadow Silk is a morph of Trapping Webs
Shadow Silk deals the following types of damage: Physical Damage, Poison 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.