midknightson asked: White Walkers are corpses empowered by dark magic of The Others. They are, all things considered, the undead, but are not necessarily zombies (they don't eat the flesh of the living or go rabid). The Others control them through their magic, but there are hints that White Walkers can exist independent of their masters. The only assured way to kill one is by burning it. The Others, in turn, are more powerful and intelligent creatures.