When Link enters the Twilight, the Triforce of Courage changes him into this form so that he does not become a spirit, as other people do.
Wolf Link can use his senses to see these spirits, or areas where he can dig. He is also faster than Link's Hylian form. Midna often rides on his back in this form, unless he is in sunlight. Eventually, Link gains the Shadow Crystal and, between this and the Master Sword, is able to turn into a wolf at any time. This becomes extremely useful, as this is the only way Link is able to freely warp, unless there are other people nearby, in which case Midna will not allow Link to transform or warp, Link attacks by jumping and biting. Link can also lunge at enemies and latch onto some. Once latched on, Link can proceed to bite viciously until the enemy knocks him off.
Wolf Link is unable to use any items; however, he is able to use his senses. He uses this ability to track down smells, including Ilia's Scent, and the scent of the Ordonian children. Additionally, many NPCs are afraid of Wolf Link, and will scream and run or cower in fear if he appears in the Light World. If Link scares the guards in Castle Town, they'll drop their weapons. The best place to do this is around the fountain.
Wolf Link also features the unique ability to charge an attack and release it to instantly kill nearly any enemy caught in the area of effect. This is done by releasing the power of Midna's Fused Shadow.
In The Legend of Zelda: Twilight Princess, Link’s wolf form is a physical manifestation of his soul's resilience against the corrupting power of the Twilight. While others are turned into helpless spirits, Link is transformed into a \"sacred beast\" due to his possession of the Triforce of Courage.
Wolf Link’s design is a blend of realistic lupine features and mystical Twili aesthetics.
Fur and Markings: He has grayish-green fur with a white underbelly, muzzle, and paws. His forehead features a unique, white jagged symbol resembling an upside-down hook.
Distinctive Features: He retains Link’s blue eyes and silver hoop earrings. He also wears a heavy gray shackle and broken chain on his front left leg—a remnant of his initial imprisonment in Hyrule Castle.
Aura: When using his \"Sense\" ability, his eyes glow, and the air around him takes on a hazy, shimmering quality, allowing him to see spirits and scent trails.