Wild Guardian is a skill located in the Animal Companions (which can be found in the Warden skill tree). Wild Guardian is an ultimate. Wild Guardian is a morph of Feral Guardian.
Wild Guardian 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.