White Walkers possess the magical powers related to ice and cold. Their arrival is usually accompanied by blizzards and the dropping of temperatures. They can also freeze anything they touch, as one froze Sam's sword to the point that it shattered. White Walkers also have superhuman strength, as one managed to toss Samwell Tarly several feet away with a single back-handed punch. The White Walkers wield swords and spears made from unique ice crystals.
However, one of their most deadly abilities is to reanimate the dead as their servants, known as Wights. They are actually capable of reviving any dead animals as wights, as a few White Walkers have been seen riding undead horses. They cannot, however, revive a corpse into servitude if the fallen creatures have died by fire. Once the Wights have been risen to serve the White Walkers, their eyes turn an icy blue, similar to the White Walkers' own eyes. Wights can only be killed by fire and serve the Walkers without question.
​As previously mentioned, one White Walker, speculated to be their master, possesses the ability to change humans into White Walkers, demonstrated at the end of Oathkeeper when he takes Craster's son into his arms and places a single finger upon its cheek, causing the baby's eyes glow blue and his skin to grow pale, taking on the appearance of the White Walkers. Whether or not this ability extends to only this White Walker, all of the White Walkers amongst his caste, or all White Walkers in general remains to be seen.